Does Thyroid Medication Affect The Menstrual Cycle?

Second, serum reproductive hormones were not measured; instead relying on urinary FSH and metabolites of estrogen and progesterone. Although these are less clinically interpretable, this made it possible to obtain serial measures every day over a three-month period, resulting in comprehensive data on menstrual cycle function. In 2015, Urmi et al. reported on the effect of hypothyroidism on menstrual patterns and fertility in women in Bangladesh 10. An abnormal menstrual cycle was experienced by 34% of women with hypothyroidism and 13.4% of women with normal thyroid function. The most common menstrual disorders in women with hypothyroidism were oligomenorrhea, polymenorrhea, and amenorrhea, respectively. However, the most common menstrual disorders in our patients were hypermenorrhea, oligomenorrhea, and menorrhagia, respectively.

Kaltsas et al. (95) study showed that 62% of patients with acromegaly experienced amenorrhea, 15% had oligomenorrhea and 4% had polymenorrhea. Data from the multi-center acromegaly registry reported that hypogonadism was observed in more than half of women with acromegaly (96). Also, PCOS is reported as a frequent manifestation of women with active acromegaly (97). The acid test of causation is, however, whether treatment of the condition corrects the menstrual dysfunction. In this study (which reported the women’s perceived loss) and more recent studies in which the menstrual loss was measured3 treatment of hypothyroidism with thyroxine decreased menstrual blood loss.

off your first Thyroid Test

The minimum age of the participant in the study is 14 years and the maximum age is 50 years with a mean age of 31 years (Table 2). This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. She was 133.8cm tall (-3.53 standard deviation scores, SDS 9), her mid-parental height was 155 cm (- 1.25 SDS 9), weight was 44 kg (-0.32 SDS 9) and Body Mass Index, BMI 24.6 (1.37 SDS 9).

• Patients without any pathology on physical and laboratory examinations were classified as controls.
• None of our tests are intended to be a substitute for seeking professional medical advice, help, diagnosis, or treatment.
• The second most complaint was polymenorrhoea in 23 (29.11%) patients which are followed by oligomenorrhoea in 12 (15.1%) patients.
• Different authors have used different methods for Anti-TPO antibody assay, and their results may vary with kits from different manufacturers.
• Patients under hormonal treatment, using contraceptives, having bleeding disorders and pregnant patients were excluded from the study.

Abnormal Uterine Bleeding and Hypothyroidism

Further studies are highly needed for better clarification of the underlying pathways of the association between endocrine disorders and the menstrual cycle. In this review, the results were presented as six subheadings, including polycystic ovary syndrome, hyperprolactinemia, thyroid disorders, diabetes, Cushing’s syndrome, and other endocrine disorders. Table 1 summarizes the hormonal changes and results of menstrual disturbances that were observed in various endocrine disorders. Figure 1 shows the schematic relationship between the endocrine disorders and the hypothalamic-pituitary-gonadal axis. Because abnormal thyroid function may have negative effects on pregnancy and fertility, making a diagnosis and beginning treatment early may be important for many of these women.

• Growth retardation is a common sign in hypothyroidism, due to the great importance of thyroid hormones in growth process.
• The acid test of causation is, however, whether treatment of the condition corrects the menstrual dysfunction.
• A descriptive cross-sectional study was conducted in all the patients with abnormal uterine bleeding in a tertiary care hospital from 2 August 2019 to 2 February 2020.
• The aim of the study is to find the prevalence of thyroid abnormality in abnormal uterine bleeding patients from puberty to those who have not attended menopause.
• According to available evidence, oligomenorrhea (cycles longer than 35 days) is the most common menstrual disturbance among endocrine disorders (thyrotoxicosis, hypothyroidism, polycystic ovary syndrome, Cushing’s syndrome, and diabetes).

Heavy vaginal bleeding stopped in the fifth day of hospitalization, with subsequent spotting until the following menstruation on the fifteenth day. This menstruation, as the following ones, was still abundant in flow, but lasted for five days. We present a case of a pediatric patient with synthroid jaune menorrhagia, which led to severe anemia, due to hypothyroidism in autoimmune thyroiditis with alteration of the coagulation system. The short answer is that it can—typically by restoring hormone levels to regulate menstruation and ovulation.

6. Other Endocrine Causes of Menstrual Disturbances

Serum thyroid hormones were measured before the menstrual function study began. Women then collected first morning urine voids and completed daily bleeding diaries every day for three cycles. Urinary estrogen and progesterone metabolites (estrone 3-glucuronide (E13G) and pregnanediol 3-glucuronide (Pd3G)) and follicle-stimulating hormone were measured and adjusted for creatinine (Cr). The relationship between thyroid dysfunction and menstrual disorders has been known for a long time; both hyperthyroidism and hypothyroidism can lead to menstrual disorders. The most common menstrual disorder in hyperthyroidism is oligomenorrhea, followed by amenorrhea and polymenorrhea, whereas, in hypothyroidism, hypermenorrhea is most common 2-4. Women aged 18–29 had longer cycles and follicular phases and greater cycle length variability than women in their thirties (Table S3).

Menorrhagia and hypothyroidism

Ethical clearance was received from the Institutional Review Committee of KIST Medical College. All patients of abnormal uterine bleeding attending the gynecology department during this period from puberty to those who have not attended menopause were included. Patients under hormonal treatment, using contraceptives, having bleeding disorders and pregnant patients were excluded from the study. To study the prevalence of thyroid dysfunction and thyroid autoimmunity in patients with menstrual disorders and to study their correlation. We also examined the associations between each thyroid hormone and day-specific E13G, Pd3G, and FSH by fitting linear mixed models with random effects for woman and cycle to account for the nesting of days within cycles and cycles within women. E13G, Pd3G, and FSH levels were adjusted for creatinine and natural log-transformed.

Table 1. Thyroid profile of patients.

The average dose of radioiodine (I-131), R-I131, which is used for treating hyperthyroidism therapy is lower than cancer treatment, indicating that its gonadal side effects are not significant (84). In our study among hypothyroid patients most common complaint of abnormal uterine bleeding was menorrhagia, followed by oligomenorrhoea, menometrorrhagia, and polymenorrhoea. No difference in menstrual abnormalities was observed between women with subclinical hypothyroidism and the control group. These findings are in contrast to a recent study by Sebtain et al., who found a significantly higher incidence of oligomenorrhea in subclinical hypothyroidism 11.

Given the wide age range in this study, upon further review, two women may have been perimenopausal (one woman aged 52 years was amenorrheic during the study and another aged 54 years had consistently short cycles). However, both women showed hormonal evidence of ovulation and when excluded, were not influential observations in analyses. Future studies with larger sample sizes may consider stratifying by age to evaluate whether thyroidal impacts on menstrual cycle function may vary.

In summary, there is little evidence about the natural history of menstruation among women with diabetes during the reproductive lifespan (21). Abnormal uterine bleeding in reproductive age women defined as an irregularity in frequency, the volume of flow, duration, and regularity of menstrual cycle in the absence of pregnancy (12). Those with hypothyroidism have high levels of TSH because your pituitary gland continuously secretes TSH to raise thyroid hormone levels.