Research Article | | Peer-Reviewed

Impact of COVID-19 on Menstrual Cycle Pattern

Received: 17 July 2025     Accepted: 11 August 2025     Published: 25 September 2025
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Abstract

Background: The coronavirus disease 2019 (COVID-19) pandemic is continuously exerting a significant effect on health care systems globally, causing extreme mortality and morbidity. As time passes our knowledge about this novel respiratory virus increase, it is clearly that its effects go behind that of the respiratory system. In recent years, there have been many reports; that there are a considerable menstrual changes in females infected with COVID-19. Data regarding the effect of COVID-19 on reproductive outcomes is limited, conflicting and only few reports from the literature reported the association between COVID-19 infection and menstrual cycle disturbances and fertility. Some studies have reported the effects of COVID-19 on fertility and menstrual cycles, but the results remain inconclusive. The aim of this study was to see if infection with COVID-19 had impacted cycle pattern in a group of young female studying at college of medicine/second stage. Method: This retrospective cross sectional study was performed on female volunteers of university medical college students; all were second stage (n = 200), who were invited to fill-out the study questionnaire programmed in a google form. Results: Twenty eight percent of case group had irregular cycle after infection which was significant different from those who didn’t get the infection (p<0.05). The relative risk of irregular cycle of participants in case group who were admitted to the hospital is higher when compared with those who did not need hospitalization (odds ratio = 3.76, CI; (1.29-10.97). More over the relative risk of irregularity increased in patients who needed CPAP at admission (Odds ratio =6.01; CI (1.56-13.17). Conclusion: this study revealed that COVID-19 infection could affect the menstrual cycle for the studied females. Further prospective studies should be done to confirm these findings and evaluate how long these menstrual irregularities lasted.

Published in American Journal of BioScience (Volume 13, Issue 5)
DOI 10.11648/j.ajbio.20251305.15
Page(s) 154-160
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Post COVID-19, Coronavirus Disease-2019 and Menstrual Cycle, Coronavirus and Menstrual Cycle, Hormonal Change

1. Introduction
Severe acute respiratory coronavirus 2 (SARS-CoV-2) infection, which causes coronavirus disease 2019 (COVID-19), was first announced on December 31, 2019, in Wuhan, China; and have been declared as pandemic on March 11, 2020 by the World Health Organization (WHO) .
In May 2023 the WHO announced the end of the coronavirus disease 2019 (COVID-19) as a global health emergency, and its transmission into an endemic health problem, but it remains an ambiguous cause of sickness around the world. COVID -19 was the cause of more than 15 million deaths in 2020 and 2021 alone . The WHO has monthly updating epidemiology of the disease regarding SARS-CoV-2 test positivity, morbidity and mortality trends, and hospital and Intensive Care Unit admissions in different regions in the world.
The sudden emergence of COVID-19 disease has globally changed economic and social activities , many officials have announced the importance of limitations in these activities in addition to the fear of getting the infection .
The main symptoms of the SARS-CoV-2 infection include Fever, respiratory problems which may be associated with gastrointestinal symptoms, anosmia, loss of taste sensation and others. Severe illness may be triggered by increasing age, comorbidities and being a male . Viral transmission is often by respiratory droplets.
During the previous three years when the COVID-19 pandemic caused millions of human loss and long-term effects; people were anxious about the loss of smell, taste and appetite, in addition to other symptoms, but nowadays the reports are increasing in regards to changes in the menstrual cycle and fertility . Recently, there have been scientific reports and even discussions on the social media that there are a considerable number of females infected with COVID-19 suffering from menstrual changes.
The virus usually requires both (ACE2) angiotensin-converting enzyme 2 receptor and TMPRSS2 transmembrane serine protease 2 (TMPRSS2) (10). The presence of these two receptors in both male and female reproductive organ cells has raised concerns that the SARS-CoV-2 infection may compromise human fertility and pregnancy . Many available review evidence have concluded that the virus have long-term effects on the human body and the female reproductive system .
Menstrual blood loss may be impacted by COVID-19’s potential to influence endothelial cell function and systemic hemostasis. Hypothalamic amenorrhea may be brought on by severe COVID-19 disease. COVID-19 infection may harm oocyte quality , ovaries and uterine endometrium and even hypothalamus-pituitary-ovary axis, and sex hormones, including estrogen, progesterone, and the anti-Müllerian hormone, consequently the menstrual cycle.
Data regarding the effect of COVID-19 on reproductive outcomes is limited and only few reports from the literature reported the association between COVID-19 infection and menstrual cycle disturbances and fertility . Some studies have reported the effects of COVID-19 on fertility and menstrual cycles, but the results remain inconclusive.
The aim of this study was to see if infection with COVID-19 has any impact on cycle pattern in a group of young female studying at college of medicine/second stage.
2. Materials and Methods
2.1. Study Design and Participants
This retrospective cross sectional study was performed on female volunteers of university medical college students; from April through August 2024, all were second stage (n = 200), to observe any changes in menstrual cycle pattern after COVID-19 infection.
2.2. Inclusion Criteria
1) Agree to participate in the survey.
2) Regular periods before the pandemic.
3) (BMI ≤ 25 kg/m2).
4) Didn’t take vaccine for corona virus.
5) No history of medical diseases or medications for chronic disease.
6) Non-smoker.
7) Not married.
2.3. Data Collection Tools and Procedures
A google form was designed in English language, through which respondents could access the survey and send their answers. Volunteers were free to fill in the questionnaire form and forward it to their colleagues.
The survey form included the following information: age, BMI, state of infection with the virus, and method of treatment (any needs for hospitalization, oxygen therapy, or C-PAP). The survey also inquired about any changes in smell or taste (which may reflects the severity of the disease) and if any acne or hirsutisms have developed after the infection. Participants were also requested to provide menstrual history both prior and after the infection. It is to be noted that volunteers could reply only once to the survey.
2.4. Definitions
All the following definitions were considered:
Normal menstrual cycle—menstruation occurring at intervals of 24-38 days, with a duration of 4-8 days and normal flow.
Menstrual cycle irregularities include:
1. Amenorrhea— the absence of menstruation for >90 days.
2. Infrequent cycle—menstruation occurring at an interval of >38 day.
3. Heavy bleeding—compared to her previous cycles.
4. Scanty bleeding—compared to her previous cycles.
Participants with a history of COVID-19 were included in the case group (n = 82), while those with no infection were considered the control group (n = 118).
To validate the results, participants were asked to provide their electronic consent before filling the survey. If they wanted to participate in the survey, they would choose agree option.
3. Results
This retrospective cross-sectional study shows after completing the questionnaire of 200 female medical students that 82 (41%) of them had been infected with COVID-19 as shown in Figure 1; they were labeled as case group, and 118 (59%) didn’t get the infection, they were labeled as control group.
Figure 1. COVID 19 percentage in studied group.
The mean age and BMI of studied groups was shown in Table 1, there was insignificant difference between case and control group (P>0.05).
Table 1. Comparison of Age and BMI in case and control group.

Parameters

Case (N=82)

Control (N=118)

P value

Age/yrs

18.79±0.79

18.73±0.73

0.56

BMI/kg/m2

23.91±6.38

23.94±5.82

0.95

p>0.05: insignificant difference from corresponding group
BMI: Body Mass Index
From the case group only 20 participants (24.4%) needed admission to ICU while the rest have been managed by simple measures at home. As shown in Figure 2. All admitted patients required the use of oxygen and 11 of them (55%) needed C-PAP.
Figure 2. Percentage of line of Management of case group (n=82).
Twenty eight percent of case group had irregular cycle after infection and there was significant differences between case and control (p<0.05), Figure 3.
Figure 3. Menstrual cycle patterns before and after COVID 19 infection in case group (n=82).
The relative risk of irregular cycle of participants in case group who were admitted to the hospital is higher when compared with those who did not need hospitalization (odds ratio = 3.76, CI; 1.29-10.97) (Table 2). More over the relative risk of irregularity increased in patients who needed CPAP at admission (Odds ratio =6.01; CI 1.56-13.17).
Table 2. The relative risk of irregular cycle of participants in case group (n=81) who admitted to hospital, the relative risk of irregularity increase in patients who needed C-PAP at admission.

Management

Odds ratio (confidence interval) for irregular cycle in Patients group

Simple measured

1.23 (0.43-3.26)

-

-

Admission

3.76 (1.29-10.97)

Oxygen

3.76 (1.29-10.97)

C-PAP

6.01 (1.56-13.17)

Statistical Analysis
All statistical analyses were performed using SPSS software (version 23). Categorical variables were described by numbers and percent, whereas continuous variables described by mean and SD. χ2-Test was used to compare between categorical variables. Student t-test was used to compare between continuous variables. The Binomial logistic regression analysis was used to get odds ratio. A two-tailed P value less than 0.05 was considered statistical significant.
4. Discussion
This study was conducted to explore the effects of SARS-CoV-2 infection on menstrual cycle pattern and if it cause any menstrual irregularities in a group of young female at second stage medical college. After interrupting the survey and statistical analysis only 41% of the surveyed population was infected with COVID- 19. The case and control group were at the same age and BMI and there was no significant difference between them (Table 1).
From the case group only 20 patients (24.4%) needed admission while the rest have been managed by simple measures at home as shown in (Figure 2). All admitted patients needed oxygen and 11 of them (55%) needed C-PAP. Since our case group are young, non-smokers and have no co morbidities by history we can assume that the need of each measure depend on their own defense mechanism and the severity of the infection they got at that time.
Twenty eight percent of case group had irregular cycle after infection and there was significant differences between case and control group (p<0.05).
Studies regarding menstrual abnormalities and ovarian reserve post COVID -19 are conflicting. A research team work done in Iraq, Jordan and United Arab Emirates reveal no significant changes between case and control group regarding menstrual abnormalities when infected with COVID . Egyptian and Iranian research centers, didn’t find any significant difference in ovarian reserve of women have been infected by COVID-19 when they compared hormone, including Anti-mullerian Hormone, before and after infection .
on reviewing research works in different research places regarding post COVID-19 menstrual irregularities we found that our survey have approved other research works .
The diversity of results with those who concluded different results may be attributed to the methodology, sample size, selection criteria and the severity of the disease at time of infection, even to the line of management during the pandemic.
The complexity of menstrual cycle cascade from the hypothalamus through the pituitary to the ovaries and uterus and interaction of this axis with prostaglandins, and neuroendocrine factors, makes menstrual disturbance very easy . It can be affected by illness, stress, nutrition, drugs, life style, or vitamin deficiency . Low levels of these vitamins can cause menstrual cycle irregularities because of their role in hormones and sex steroid synthesis .
The virus usually requires both (ACE2) angiotensin-converting enzyme 2 receptor and transmembrane serine protease 2 (TMPRSS2) . The presence of these two receptors in both male and female reproductive organ cells has raised concerns that the SARS-CoV-2 infection may compromise human fertility and pregnancy . The virus usually may hinder many aspect of female reproductive functions, including follicular development, sex steroid synthesis, endometrial shedding, and repair . These receptors are highly prevalent in the female reproductive system including the uterus . The binding of COVID-19 to the ACE2 receptor in the endometrium may be the cause of menstrual cycle irregularities . Infection leads to elevated reactive oxygen species and oxidative stress, which can disturb ovarian function by triggering inflammatory reactions .
The initiation of menstrual bleeding in the human uterus requires vasoconstriction of the spiral artery by Ang II, so a normal menstrual cycle depends on the accurate function of Ang II and its receptors in endometrial tissue. Any disturbance in this receptor expression leads to abnormal uterine bleeding .
Unfortunately, most large-scale COVID-19 investigations have ignored menstrual cycle changes, leaving questions about how many women experienced menstrual changes and the duration of these changes .
The fact that the disease itself have been shown to have impact on the psychological aspect of the infected subject which adds another cause for this menstrual irregularities, this has been documented by many studies during and after the pandemic . Stress, whether physical or psychological, have direct effect on both axes - the hypothalamic-pituitary-gonadal (HPG) and hypothalamic-adrenal axes . The role of cortisol in stress is documented by many studies; cortisol has inhibitory effects on the HPG axis. Cortisol and stress affect this axis, as increasing levels of cortisol inhibit GnRH secretion. This action helps to explain why high stress can lead to irregular menses and amenorrhea .
The relative risk of irregular cycle of participants in case group who underwent simple measures was higher when compared with subjects who didn’t require any treatment (odds ratio = 1.23, CI; 0.43-3.26), (Table 2) and this risk was even higher in the participants who needed C-PAP at admission.
This indicates that the lack of oxygen increases the likelihood of developing irregular cycle.
In normal conditions there is a temporal physiological hypoxia in the upper endometrial zones during menstruation , and that has been shown in mean time to enhance endometrial repair . Endometrial hypoxia inducible factor (HIF)-1α protein is also needed during the luteal phase for angiogenesis and tissue building .
It has been found by Devauxt; and Kadhim that 20-40% of patients have some sort of hypoxia termed as ‘silent’ or asymptomatic hypoxia and Acute COVID-19 can result in very low oxygen saturation , the activation of HIF-1 protein outside the physiological luteal phase and changes of endometrial hypoxic pathways, may make endometrial angiogenesis/metabolism unbalanced and lead to irregular uterine bleeding .
One important point to be mentioned about this survey is that it was carried on young female, the same age, BMI, not married, non-smoker and at the same educational level, which make confounders very minimal or negligible.
5. Conclusion
This study revealed that COVID-19 infection could affect the menstrual cycle for the studied females. Further prospective studies should be done to confirm these findings and evaluate how long these menstrual irregularities lasted.
Abbreviations

ACE2

Angiotensin-Converting Enzyme 2

BMI

Body Mass Index

COVID-19

Coronavirus Disease 2019

CPAP

Continuous Positive Airway Pressure

HPG

Hypothalamic-Pitutary-Gonadal

HIF

Hypoxia Inducible Factor

TMPRSS2

Transmembrane Serine Protease 2

WHO

Word Health Organization

Acknowledgments
The authors would like to thank all the students participating in this study.
Author Contributions
Hanan Altaee: Methodology, Resources, Writing – original draft, Writing – review & editing
Ban J Edan: Data curation, Formal Analysis, Methodology, Writing – original draft, Writing – review & editing
Ethical Approval and Consent to Participate
The study protocol and all materials received approval from the Ethics Committee of College of medicine -University of Babylon. Data were handled with strict confidentiality, ensuring the privacy of the participants; following the participants consent by choosing agree option in the survey.
Conflicts of Interest
The authors declare no conflicts of interest.
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Cite This Article
  • APA Style

    Altaee, H., Edan, B. J. (2025). Impact of COVID-19 on Menstrual Cycle Pattern. American Journal of BioScience, 13(5), 154-160. https://doi.org/10.11648/j.ajbio.20251305.15

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    Altaee, H.; Edan, B. J. Impact of COVID-19 on Menstrual Cycle Pattern. Am. J. BioScience 2025, 13(5), 154-160. doi: 10.11648/j.ajbio.20251305.15

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    Altaee H, Edan BJ. Impact of COVID-19 on Menstrual Cycle Pattern. Am J BioScience. 2025;13(5):154-160. doi: 10.11648/j.ajbio.20251305.15

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  • @article{10.11648/j.ajbio.20251305.15,
      author = {Hanan Altaee and Ban Jaer Edan},
      title = {Impact of COVID-19 on Menstrual Cycle Pattern
    },
      journal = {American Journal of BioScience},
      volume = {13},
      number = {5},
      pages = {154-160},
      doi = {10.11648/j.ajbio.20251305.15},
      url = {https://doi.org/10.11648/j.ajbio.20251305.15},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajbio.20251305.15},
      abstract = {Background: The coronavirus disease 2019 (COVID-19) pandemic is continuously exerting a significant effect on health care systems globally, causing extreme mortality and morbidity. As time passes our knowledge about this novel respiratory virus increase, it is clearly that its effects go behind that of the respiratory system. In recent years, there have been many reports; that there are a considerable menstrual changes in females infected with COVID-19. Data regarding the effect of COVID-19 on reproductive outcomes is limited, conflicting and only few reports from the literature reported the association between COVID-19 infection and menstrual cycle disturbances and fertility. Some studies have reported the effects of COVID-19 on fertility and menstrual cycles, but the results remain inconclusive. The aim of this study was to see if infection with COVID-19 had impacted cycle pattern in a group of young female studying at college of medicine/second stage. Method: This retrospective cross sectional study was performed on female volunteers of university medical college students; all were second stage (n = 200), who were invited to fill-out the study questionnaire programmed in a google form. Results: Twenty eight percent of case group had irregular cycle after infection which was significant different from those who didn’t get the infection (pConclusion: this study revealed that COVID-19 infection could affect the menstrual cycle for the studied females. Further prospective studies should be done to confirm these findings and evaluate how long these menstrual irregularities lasted.
    },
     year = {2025}
    }
    

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    T1  - Impact of COVID-19 on Menstrual Cycle Pattern
    
    AU  - Hanan Altaee
    AU  - Ban Jaer Edan
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    T2  - American Journal of BioScience
    JF  - American Journal of BioScience
    JO  - American Journal of BioScience
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    SN  - 2330-0167
    UR  - https://doi.org/10.11648/j.ajbio.20251305.15
    AB  - Background: The coronavirus disease 2019 (COVID-19) pandemic is continuously exerting a significant effect on health care systems globally, causing extreme mortality and morbidity. As time passes our knowledge about this novel respiratory virus increase, it is clearly that its effects go behind that of the respiratory system. In recent years, there have been many reports; that there are a considerable menstrual changes in females infected with COVID-19. Data regarding the effect of COVID-19 on reproductive outcomes is limited, conflicting and only few reports from the literature reported the association between COVID-19 infection and menstrual cycle disturbances and fertility. Some studies have reported the effects of COVID-19 on fertility and menstrual cycles, but the results remain inconclusive. The aim of this study was to see if infection with COVID-19 had impacted cycle pattern in a group of young female studying at college of medicine/second stage. Method: This retrospective cross sectional study was performed on female volunteers of university medical college students; all were second stage (n = 200), who were invited to fill-out the study questionnaire programmed in a google form. Results: Twenty eight percent of case group had irregular cycle after infection which was significant different from those who didn’t get the infection (pConclusion: this study revealed that COVID-19 infection could affect the menstrual cycle for the studied females. Further prospective studies should be done to confirm these findings and evaluate how long these menstrual irregularities lasted.
    
    VL  - 13
    IS  - 5
    ER  - 

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