10 Early Signs of Hormonal Imbalance in Women and When to Seek Help

Ashley Harwyn, PA-C, ABAAHP  |  Published June 17, 2025  |  Last updated October 6, 2026  |  20 min read

Ten common signs, other conditions that share them, and the tests the cited guidelines use to tell them apart before anyone starts treatment.

Fatigue, mood swings, irregular periods, weight that will not budge, hot flashes, low libido, thinning hair, adult acne, broken sleep, and brain fog were the ten signs in the original version of this post. Each one is worth taking seriously. Several of them, including fatigue, weight gain, thinning hair, and irregular periods, are also on the National Institutes of Health list of common hypothyroid symptoms.[3] This guide pairs every sign with other causes named by the sources cited here and the tests those sources describe, so you can walk into a visit with better questions and a clearer picture.

• Hot flashes, night sweats, trouble sleeping, and changes in your period are common in the menopausal transition, which most women begin between ages 45 and 55.[1]
• For women 45 and older with menopause-associated symptoms, the UK's national menopause guideline says perimenopause can be identified without lab tests, and advises against estradiol or AMH tests for that purpose.[2]
• An underactive thyroid can cause fatigue, weight gain, thinning hair, and irregular periods, and it cannot be diagnosed from symptoms alone.[3]
• Heavy menstrual periods raise the risk of iron-deficiency anemia, and a blood test of your blood count, iron, and ferritin helps diagnose it.[4]
• Irregular cycles with acne or unwanted hair growth can point to PCOS, which affects 10% to 13% of women of reproductive age.[5]
• The National Institute of Mental Health advises talking to a provider when depression symptoms last most of the day, nearly every day, for at least two weeks.[7]

Is it your hormones, or something that only looks like hormones?

Hormones shift across the menstrual cycle, in pregnancy and the postpartum period, and through perimenopause, and those changes can bring on a depressive episode in some women.[7] During the menopausal transition, the body's production of estrogen and progesterone declines greatly.[1] In this post, “hormonal imbalance” means a cluster of symptoms that feels new, persistent, and out of proportion to your routine. That is a fair reason to seek care. It is also a cluster that several treatable conditions can produce.[3][4][7]

The thyroid is the clearest example. The National Institute of Diabetes and Digestive and Kidney Diseases lists fatigue, weight gain, trouble tolerating cold, dry or thinning hair, depression, and heavy or irregular periods among the common symptoms of hypothyroidism.[3] Irregular periods and mood changes also appear in descriptions of the menopausal transition.[1][7] The same agency adds that fatigue and weight gain are common and do not necessarily mean a thyroid problem, which is a useful reminder that symptoms narrow the search but rarely close it.[3]

Here are the ten signs from the original version of this post, each paired with other causes or factors the cited sources name and a first step to raise at a visit. It is a map for the conversation, not a self-diagnosis tool.

Notice how often the same few items repeat: a thyroid blood test, a blood count with iron and ferritin, questions about sleep and mood, and a careful history. Hormone blood tests have a narrower role in these guidelines. The NICE guideline reserves an FSH test for confirming menopause in specific age groups, and the PCOS guideline ties testosterone testing to suspected PCOS.[2][5]

Which signs point most clearly toward perimenopause?

Perimenopause, also called the menopausal transition, is the time leading up to menopause, when the ovaries' production of estrogen and progesterone declines greatly.[1] According to the National Institute on Aging, most women begin this transition between ages 45 and 55, the average age of menopause in the United States is 52, and you only know you have reached menopause after a full year without a period or spotting.[1] Symptoms related to menopause can last two to eight years, and the timing and symptoms vary widely from one woman to the next.[1]

A change in your period may be the first thing you notice. Cycles may get shorter or longer, and bleeding may be lighter or heavier than you are used to.[1] Hot flashes and night sweats are among the most common symptoms, and most hot flashes last between 30 seconds and 10 minutes.[1] Trouble sleeping, vaginal dryness, a lower sex drive, moodiness, and forgetfulness can all join in.[1] To judge whether the transition is a likely cause, NIA says your doctor may ask about your age, symptoms, and family history.[1]

Blood tests play a limited role here. The UK's National Institute for Health and Care Excellence (NICE) menopause guideline says perimenopause can be identified without laboratory tests in otherwise healthy women 45 and older who have vasomotor symptoms that recently started and any change in their menstrual cycle.[2] It specifically advises against using anti-Mullerian hormone, inhibin, estradiol, or antral follicle count to identify perimenopause or menopause in that age group.[2] Under that guideline, your age, your cycle changes, and your symptoms are the basis for the answer at 45 and older.

Labs matter more in younger women. NICE suggests considering an FSH level to confirm menopause in women aged 40 to 45 with symptoms and cycle changes, and in women under 40 when menopause is suspected.[2] NIA also notes that in some cases, for example if periods stopped at an early age, a doctor may suggest a blood test to check hormone levels.[1] Our post on perimenopause care in Mount Pleasant covers care during the transition itself.

Could it be your thyroid or your iron instead?

Thyroid and iron problems both share symptoms with hormone shifts, and both are diagnosed with blood tests.[3][4] The thyroid first. Nearly 5 in 100 Americans aged 12 and older have hypothyroidism, most cases are mild or have few obvious symptoms, and women are much more likely than men to develop it.[3] Because it develops slowly, you may not notice symptoms for months or even years.[3]

The key point from NIDDK is that hypothyroidism cannot be diagnosed on symptoms alone, because many of its symptoms are the same as those of other diseases.[3] A doctor may use thyroid blood tests and imaging tests to confirm it and find the cause.[3] If you have already been told your thyroid is “fine” but still feel unwell, our thyroid management page explains why a TSH blood test is the recommended first-line check and what a normal result does and does not mean.

Iron is the second quiet suspect, especially if your periods are heavy. The National Heart, Lung, and Blood Institute lists heavy menstrual periods among the conditions that raise the risk of iron-deficiency anemia.[4] Symptoms include fatigue, dizziness or lightheadedness, cold hands and feet, and pale skin, although people with mild or moderate iron-deficiency anemia may have no symptoms at all.[4] Undiagnosed or untreated, it may cause complications such as fatigue, headaches, and restless legs syndrome.[4]

The test is straightforward. To help diagnose iron-deficiency anemia, a doctor orders a blood test to check your complete blood count, hemoglobin, blood iron, and ferritin.[4] The two sources connect in one place worth knowing: NIA notes that during the menopausal transition you might bleed more than usual, and NHLBI lists heavy periods as a risk for iron-deficiency anemia.[1][4] If your periods have become heavier, it is reasonable to ask about iron. A comprehensive lab panel typically includes a complete blood count and a thyroid panel; if iron is your concern, ask whether ferritin is included.

Hair changes deserve a separate word. The American Academy of Dermatology notes that shedding 50 to 100 hairs a day is normal.[9] Excessive shedding, called telogen effluvium, is common after childbirth, a high fever, surgery, losing 20 pounds or more, a lot of stress, or stopping birth control pills, and most people notice it a few months after the event.[9] As the body readjusts, the shedding stops, and within six to nine months hair tends to regain its normal fullness.[9] Thinning hair is also on the NIDDK list of hypothyroid symptoms.[3]