Hormonal imbalance symptoms: the signs, the hormone behind each, and the tests that check it

Tiredness after a full night, weight that creeps up without a change in eating, irregular periods, a drop in sex drive and skin breaking out like it did at 16 are the usual signs people put down to hormones. Hormonal imbalance is a description of those symptoms. The conditions doctors find behind it are a short list: thyroid disease, PCOS, low testosterone, insulin resistance, high prolactin and the swings of perimenopause. Each has a specific blood test, and most of those tests only read true when drawn at the right time of day or the right day of the cycle.

What a hormonal imbalance is

Hormones are chemical messages made by glands and carried in the blood. Androgens are the male-type hormones, mainly testosterone, that women also make in smaller amounts. Most of the hormones people mean by hormonal imbalance run on the same chain of command: the hypothalamus, a control center at the base of the brain, signals the pituitary gland just below it, the pituitary sends a messenger hormone to a target gland (the thyroid, ovaries, testes or adrenals), and the target gland's hormone travels back up to turn the signal down. Doctors call that loop negative feedback, and it is why one hormone that moves drags others with it.

Plenty of hormone movement is normal. Cortisol peaks soon after waking and falls through the day, estradiol and progesterone rise and fall across each menstrual cycle, and puberty, pregnancy and perimenopause reset the whole system. A hormonal disorder is a level, or a response, that falls outside those expected swings and causes symptoms. Test sellers often use the word imbalance for both, so a normal cycle swing can be presented as a problem.

Which symptom points to which hormone

The table joins each common symptom to the hormone systems usually behind it and the first tests a doctor tends to order. SHBG (sex hormone binding globulin) is the protein that carries testosterone in the blood, DHEA-S is an androgen made by the adrenal glands, and A1C shows average blood sugar over about three months. Several rows also have causes that are not hormonal at all, such as low iron for tiredness and hair shedding, so each linked page covers the full list.

Hormonal weight gain most often comes from an underactive thyroid, insulin resistance or menopause. Hormonal anxiety and mood swings most often track thyroid disease or the menstrual cycle itself, and an overactive thyroid can feel like constant anxiety with a racing heart. If you feel cold, slow and heavy, the always cold page covers the other causes.

Signs of hormonal imbalance in women

Cycle change is the clearest hormonal sign in women. Cycles that run shorter than 21 days or longer than 35, vary by more than a week from month to month, or stop altogether usually mean ovulation is not happening on schedule, and the main causes are PCOS, thyroid disease, high prolactin, under-eating or heavy training, and perimenopause. The irregular periods page works through them in order, and blood tests for women covers the wider set.

PCOS (polycystic ovary syndrome) is the most common hormone disorder in women of reproductive age, affecting about 10 to 13% of them ¹. The 2023 international guideline diagnoses it in adults with two of three features: irregular or absent ovulation, signs of excess androgens (acne, facial or body hair, scalp thinning, or a raised testosterone on a blood test), and polycystic ovaries on ultrasound or a raised AMH (anti-Mullerian hormone, a marker of how many egg follicles the ovaries hold) ¹. Other causes of the same picture, such as thyroid disease and high prolactin, are ruled out first.

From the early 40s, perimenopause brings irregular cycles, hot flashes, night sweats, broken sleep, low mood and brain fog, sometimes years before periods stop; perimenopause and menopause each have their own page. High prolactin, made by the pituitary, can stop periods and cause a milky nipple discharge when not breastfeeding; the high prolactin page covers what raises it. Thyroid disease runs far more often in women than men, and an underactive thyroid can make periods heavier and more frequent. Trouble getting pregnant can be the first sign of PCOS, thyroid disease or high prolactin, and vaginal dryness and painful sex are common hormonal signs in perimenopause and after menopause.

Signs of hormonal imbalance in men

In men, most hormone questions come back to testosterone, and low testosterone has its own page. The European Male Ageing Study followed more than 3,000 men aged 40 to 79 and found that three sexual symptoms tracked low testosterone most closely: fewer morning erections, low sexual desire and erectile dysfunction ³. Tiredness, low mood and losing muscle were far less specific. Late-onset hypogonadism, defined by those three symptoms plus low total and free testosterone, affected about 2.1% of the men ³, about 1 in 50 men in that age range.

We recommend diagnosing hypogonadism in men with symptoms and signs of testosterone deficiency and unequivocally and consistently low serum total testosterone and/or free testosterone concentrations (when indicated).Bhasin S et al., Endocrine Society Clinical Practice Guideline, 2018 ²

Unequivocally and consistently means a single low testosterone reading does not settle it. The Endocrine Society asks for a fasting sample taken in the morning and a repeat to confirm ², because testosterone dips after poor sleep, illness, a heavy training block or a large meal. The guideline uses about 264 ng/dL as the lower limit for healthy young men ².

Men also get high prolactin, which lowers testosterone and libido, and raised estradiol, usually from extra body fat or from taking testosterone; the high estradiol page covers both. Thyroid disease shows up in men as in women, with tiredness, weight change and feeling cold or hot. Obesity lowers SHBG, which pulls total testosterone down even when the free, usable fraction is fine; the male hormone panel guide shows how to read the set together.

CalculatorFree testosterone calculatorTotal testosterone near the line with an unusual SHBG? This estimates the free fraction from both numbers.Work it out

What causes hormones to go off

The causes fall into three groups. Medical conditions come first: thyroid disease (most often Hashimoto's), PCOS, type 2 diabetes and insulin resistance, and less often pituitary tumors that raise prolactin, Cushing's syndrome and Addison's disease. Life stages come second: puberty, pregnancy, the months after birth, perimenopause and menopause. The third group pushes levels without any disease:

• Short sleep: in a small study of 10 young men, one week of five-hour nights lowered daytime testosterone by 10 to 15% ⁸.
• Large weight gain or loss, under-eating and heavy endurance training, which can stop periods and lower testosterone.
• Regular heavy drinking.
• Medicines: steroid tablets and inhalers, opioids, the contraceptive pill, some antipsychotics and anti-sickness drugs, and anabolic steroids.

Some chemicals in plastics and packaging, such as BPA and some phthalates, act on hormone receptors in lab and population studies. No blood test measures their effect on a person's symptoms, so cutting exposure is reasonable but will not show up on a hormone panel.

Stress raises cortisol, and long-running stress disturbs sleep, appetite and cycles. Stress does not wear the adrenal glands out, though. Adrenal fatigue appears on many supplement sites, and the evidence against it is summarized on our own page:

Which blood tests check for hormonal imbalance, and when to take them

A sensible first round for most adults (which blood tests to get goes wider) is TSH, with free T4 added when TSH is out of range ¹¹, plus fasting glucose or A1C. Women with cycle changes, acne or extra hair usually add prolactin, total testosterone, SHBG, FSH and LH; men with sexual symptoms add morning total testosterone, SHBG and prolactin. The female hormone panel guide and the male hormone panel guide go marker by marker. Timing changes these results more than almost anything else:

CalculatorHOMA-IR calculatorHave a fasting insulin and fasting glucose from the same draw? This turns the pair into a HOMA-IR insulin resistance score.Work it out

High-dose biotin, sold for hair and nails, can push many hormone tests falsely high or falsely low, thyroid tests included: in a study of healthy adults taking 10 mg a day, several common lab tests gave misleading results that could point toward a hormone problem that was not there ⁶. Tell the person ordering the test about any biotin, and ask whether to pause it first; how to prepare for a blood test covers the rest. Results taken on the pill read differently again, explained on birth control and blood tests.

Why a normal result may not settle it

A normal hormone test rules out some causes and leaves others standing. PMS is the clearest case. In a 1998 NIH study, researchers switched off the ovaries with medication and then added estradiol or progesterone back: symptoms returned only in women with a history of PMS, while their hormone levels matched those of women without it ⁵. The study concluded that PMS symptoms come from an abnormal response to normal hormone changes, so a blood test in PMS usually looks fine. A symptom diary over two cycles diagnoses PMS; the PMS page explains how.

Perimenopause tricks tests in a different way. FSH can sit in the normal range one month and the menopausal range the next, so NICE advises diagnosing perimenopause and menopause in women over 45 from symptoms alone, without an FSH test, and keeps FSH for younger women ⁴.

Single readings mislead elsewhere too. One high morning cortisol does not mean Cushing's syndrome, which needs dedicated screening tests ¹⁰ (see high morning cortisol); one low testosterone needs a repeat ²; and a mildly high prolactin is checked against the stress of the draw and any medicines, often with a repeat, before anyone orders a scan ⁹. A result can also sit inside the reference range and still be a real change for you, which is why trends beat single readings.

The symptoms are worth chasing even when the first test looks fine, because the causes behind them carry long-term risks. Periods that stay absent for months mean low estrogen, which thins the bones over time. PCOS raises the risk of type 2 diabetes and of thickening of the womb lining ¹. Untreated thyroid disease affects the heart rhythm and cholesterol.

What helps

Treatment follows the named cause and is decided with a doctor: thyroid hormone for an underactive thyroid, PCOS care aimed at cycles, skin and metabolic risk, hormone therapy for menopause symptoms when a doctor and patient decide the benefits outweigh the risks (see menopause), treatment for sleep apnea, and a prescription workup for confirmed low testosterone. In women with PCOS who carry extra weight, losing 5 to 10% of body weight can restore ovulation and improve insulin resistance and androgen levels ¹.

The everyday habits that support hormone health are plain ones: seven or more hours of sleep ⁸, losing excess weight ¹, strength training, eating enough to cover heavy training, and keeping alcohol low. How to increase testosterone and how to lower cortisol go into each.

Supplements sold for hormone balance have thin evidence. Small ashwagandha trials report modest drops in stress scores and morning cortisol, and small testosterone rises in men ¹³. DIM (diindolylmethane, from broccoli and cabbage) changes how estrogen is broken down, but there is little trial evidence that it eases symptoms. Ashwagandha has been linked to rare liver injury, can shift thyroid levels and is not advised in pregnancy or with an overactive thyroid ¹³, so check with a doctor or pharmacist before taking it alongside thyroid or other medicines. Do not stop or change thyroid medicine, steroids, the pill or hormone therapy because of a symptom list; ask your prescriber first.

Supplements marketed for hormone balance

Mixed evidenceAshwagandhaSmall trials found lower stress scores and morning cortisol, and small testosterone rises in men; not for pregnancy, and check with a doctor if on thyroid medicine.In our shop

Early evidenceDIMShifts how estrogen is broken down; little evidence it eases symptoms.In our shop

When to see a doctor quickly

• No period for three months or more, and not pregnant.
• Milky discharge from the nipples when not breastfeeding.
• New headaches with blurred vision or loss of side vision, which can mean a pituitary growth. A sudden, severe headache with sudden vision loss is an emergency.
• Facial hair, a deepening voice or a growing clitoris that develop over weeks or months, which can mean an androgen-making tumor.
• New erection problems with low libido, or a breast lump in a man.
• Weight loss with a racing heart, tremor and heat intolerance.
• Heavy thirst, passing a lot of urine and weight loss, which can mean very high blood sugar: get a blood sugar check within a day or two (see type 2 diabetes).

These signs need a doctor within days to weeks. Go to the emergency department the same day for: vomiting, fainting or confusion with severe weakness; a sudden, severe headache with sudden loss of vision or double vision; a racing or irregular heartbeat with fever, confusion or chest pain; or heavy thirst and urination with vomiting, deep fast breathing or drowsiness.

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