Treating amenorrhea depends entirely on what’s causing it, because a missing period is a symptom, not a diagnosis on its own. The underlying cause could be anything from stress and low body weight to a thyroid problem or a hormonal imbalance like PCOS. Once that cause is identified, treatment is usually straightforward and effective. The first step is always figuring out why your period stopped.
Primary vs. Secondary Amenorrhea
These two categories shape how your provider approaches treatment. Primary amenorrhea means you’ve never had a period by age 15, or within three years of your breasts starting to develop. Secondary amenorrhea means your period has stopped for three months or longer if your cycles were previously regular, or six months or longer if they were irregular.
Primary amenorrhea often points to a structural or genetic issue that needs specialized evaluation. Secondary amenorrhea is far more common and usually tied to lifestyle factors, hormonal shifts, or treatable medical conditions. Most people searching for treatment information are dealing with secondary amenorrhea.
How the Cause Is Identified
Before any treatment starts, you’ll need blood work. A pregnancy test comes first, since pregnancy is the most common reason periods stop in reproductive-age women. After that, your provider will typically check thyroid function, prolactin levels, and reproductive hormones like FSH and LH.
Prolactin levels below 15 to 20 ng/mL rule out excess prolactin as a cause. If your levels come back mildly elevated (20 to 40 ng/mL), the test should be repeated before any diagnosis is made, since prolactin can spike temporarily from stress, certain medications, or even a recent meal. FSH levels help distinguish whether the problem originates in the brain’s signaling to the ovaries or in the ovaries themselves.
Depending on results, you may also need imaging. An ultrasound can evaluate your ovaries and uterus, and an MRI of the pituitary gland is sometimes ordered if prolactin levels are significantly high.
Lifestyle and Weight-Related Causes
Functional hypothalamic amenorrhea is one of the most common forms, and it’s driven by energy deficit. Your brain essentially shuts down reproductive signaling when it senses that your body doesn’t have enough fuel. This happens with restrictive eating, excessive exercise, significant weight loss, or chronic stress, and often a combination of all three.
Treatment here isn’t medication. It’s restoring energy balance. That means eating more, exercising less intensely, and addressing psychological stressors. For athletes and people with eating disorders, this can be the hardest form of amenorrhea to treat because the solution requires changing deeply ingrained behaviors. Working with a dietitian and a therapist who specialize in these patterns makes a significant difference.
Recovery timelines vary. Some people see their period return within a few months of gaining weight or reducing exercise. Others take six months to a year. The key predictor is sustained energy availability, meaning you’re consistently taking in more calories than you’re burning, not just for a few days but over weeks and months.
Protecting Your Bones During Recovery
Long stretches without a period lower your estrogen levels, which weakens bones. Women with hypothalamic amenorrhea face real risk of stress fractures and early bone loss. While working toward recovery, aim for 1,000 to 1,300 mg of calcium and 400 to 800 IU of vitamin D daily, through food or supplements. These numbers are adapted from osteoporosis guidelines since there isn’t specific data for amenorrhea, but they represent the best current guidance.
PCOS-Related Amenorrhea
Polycystic ovary syndrome is another leading cause. In PCOS, the ovaries produce excess androgens (sometimes called “male hormones,” though everyone has them), which disrupt ovulation and cause irregular or absent periods.
Treatment depends on your goals. If you’re not trying to conceive, hormonal birth control is typically the first-line approach. It regulates your cycle, reduces androgen levels, and protects the uterine lining from thickening unchecked, which is a real concern when periods are absent for months at a time. An unprotected uterine lining that builds up without shedding raises the risk of abnormal cell changes over the long term.
If you are trying to get pregnant, the approach shifts to medications that stimulate ovulation. Your provider will guide that process with monitoring to ensure a safe response. For people with PCOS who also have insulin resistance, improving insulin sensitivity through diet changes, regular movement, and sometimes medication can help restore ovulation on its own. Even modest weight loss of 5 to 10 percent of body weight, when applicable, often restarts cycles in people with PCOS.
High Prolactin Levels
A small, benign growth on the pituitary gland (called a prolactinoma) can pump out excess prolactin, which suppresses the hormones needed for ovulation. This is more common than most people realize, and it’s one of the most treatable causes of amenorrhea.
Medication shrinks these growths and lowers prolactin levels effectively. Treatment typically starts at a low dose taken twice a week and is adjusted based on your prolactin levels over the following months. Most people see their prolactin normalize and their period return without ever needing surgery. You’ll have periodic blood tests to monitor levels, and imaging may be repeated to confirm the growth is shrinking.
Thyroid Problems
Both an underactive and overactive thyroid can disrupt your cycle. Hypothyroidism is the more common culprit. Normal TSH levels fall between 0.4 and 4.0 mIU/L, and levels above that range are associated with menstrual irregularities including amenorrhea. In one analysis, women with elevated TSH who were treated with thyroid hormone replacement showed significant improvement in their cycles.
The good news is that thyroid-related amenorrhea typically resolves once thyroid levels are brought back to normal. This usually takes several weeks to a few months on medication, with dosage adjustments along the way based on follow-up blood work.
Premature Ovarian Insufficiency
Premature ovarian insufficiency (POI) means the ovaries stop functioning normally before age 40. This is different from early menopause in that ovarian function can sometimes flicker on and off unpredictably, but the overall trajectory is toward diminished hormone production.
Treatment centers on hormone replacement to provide the estrogen and progesterone your body is no longer making enough of. Guidelines from the American Society for Reproductive Medicine recommend a daily dose of at least 2 mg of oral estradiol or 100 micrograms delivered through a skin patch. A progestogen is always added for anyone with an intact uterus to protect the uterine lining from overgrowth. Transdermal delivery (patches or gels) may be preferred because it produces hormone levels closer to what the body would naturally make.
This isn’t just about getting a period back. Estrogen replacement in POI protects your bones, cardiovascular system, and brain health for decades to come. For young women diagnosed with POI who haven’t yet gone through puberty, estrogen is introduced gradually starting around age 11 and increased over two to three years to mimic the body’s natural progression. Progestogen is added after about two years of estrogen therapy or when breakthrough bleeding occurs.
If low sexual desire is an issue, transdermal testosterone at doses that approximate normal premenopausal levels is an option that may help. Vaginal estrogen can also be added separately to address dryness, discomfort, or urinary symptoms that sometimes accompany POI.
What Recovery Looks Like
How quickly your period returns depends on the cause and how well treatment addresses it. Thyroid correction and prolactin-lowering medication often produce results within a few months. Lifestyle changes for hypothalamic amenorrhea can take longer because the body needs sustained evidence that energy balance has been restored before it turns reproductive function back on.
For people recovering from cancer treatments that caused amenorrhea, data shows that about 70% of women eventually resume menstruating, and 90% of those who do recover their periods see them return within two years of treatment. Younger age at diagnosis and less intensive treatment exposure are associated with faster recovery.
In all cases, treatment isn’t just about the period itself. Regular menstrual cycles are a sign that your hormonal system is functioning well, and restoring that function protects your bones, heart, and long-term fertility. If your period has been absent for three months or more, getting an evaluation sooner rather than later gives you the best chance of identifying a treatable cause and preventing complications like bone loss from progressing.