Missed Period: Causes, Normal Ranges, and What Counts as a Deviation

You opened the calendar and recalculated the days more than once. Your period didn't come on time, and the first thought is usually pregnancy, although there are many more reasons for a missed period. Below is a calm analysis: which numbers are considered normal, what else shifts the cycle, and when talking to a doctor stops being a formality.

What is considered a missed period and what delay is acceptable

A missed period is defined as the absence of cyclic bleeding for more than 35 days. If there is no period for six months or more, it is a matter of amenorrhea — secondary, if the cycle was previously normal.

Reference norm: the cycle lasts from 28 to 35 days, and a delay of up to 5–7 days is an acceptable deviation. The key indicator is regularity: the cycle is counted from the first day of menstruation to the first day of the next, and if the interval is different each time, these are irregular periods, even when the delay is within a week. In adolescents in the first two years after menarche, a stable cycle is often absent: the hormonal background is still unstable.

What can cause a missed period besides pregnancy

Pregnancy is the most common cause, but far from the only one. The list includes: stress, the onset of perimenopause (usually between 45 and 55 years), polyendocrine metabolic ovarian syndrome, rapid weight loss, excess body weight, excessive exercise, hormonal contraceptives — injections, intrauterine system, oral contraceptive pills, as well as breastfeeding.

The cycle is also disrupted against the background of other conditions: heart disease, diabetes, thyroid dysfunction, pituitary tumors, ovarian insufficiency, adrenal disorders. Separately — scar changes after curettage and severe pelvic infections, as well as certain medications, including those for cancer or psychosis treatment.

Missed period and associated signs: discharge, breasts, skin

Along with a missed period, the following may occur: changes in breast size and discharge from them, weight gain or loss, acne and male-pattern hair growth, vaginal dryness, voice changes. With a pituitary tumor, headache and visual impairment are added.

Brown discharge during a missed period is evaluated by a doctor together with other symptoms and examination results. The situation "breasts hurt but no period" also does not have a single explanation: breast changes are among the accompanying signs, but they must be assessed in the overall picture.

Do stress, colds, thrush, and thyroid diseases affect the cycle

Stress is one of the common causes, regardless of how long it lasts: it affects brain functions that regulate the reproductive system.

Cold illnesses, like chronic diseases — gastritis, diabetes, thyroid dysfunction, kidney diseases — may be accompanied by a delay. For the thyroid gland, both increased and decreased activity (hyper- and hypothyroidism) matter; the doctor determines which specific disease caused the disorder.

Thrush belongs to infectious and inflammatory conditions; the connection of thrush specifically with a delay should be assessed by a doctor.

What tests and examinations are prescribed for a missed period

They start with an examination, including a gynecological one, and a pregnancy test. Further, blood tests for hormones may be possible: estradiol, follicle-stimulating hormone, luteinizing hormone, prolactin, testosterone, thyroid-stimulating hormone.

• Ultrasound of the pelvic organs or hysterosonography — ultrasound with injection of a solution into the uterine cavity
• CT or MRI of the head if space-occupying lesions are suspected
• biopsy of the uterine lining
• genetic testing

Based on the results, you may be referred to a gynecologist or endocrinologist if additional examinations are needed.

When to see a doctor for a missed period

Guidelines: periods have not come three times in a row; the cycle has become irregular; periods have not started by age 15; along with the delay, there are weight changes, fatigue, facial hair growth, dry or oily skin. Separately — if more than one cycle is missed. After stopping hormonal contraceptives, a delay of 2–3 cycles is a reason to see a gynecologist; after childbirth — if there is no period for more than a year.

A missed period by itself is not a reason to call an ambulance; 103/112 — for signs of a life-threatening condition, such as symptoms of stroke or heart attack.

This text is for reference: it helps you navigate and prepare questions, but does not replace a doctor's consultation, who will assess your specific situation.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer