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Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Male rats grow hair faster than females, and certain hormones can slow or slightly increase hair growth, but not significantly beyond natural rates.

Male rats have androgen receptors in their liver, which are different from proteins that bind estrogen.

Some steroid-induced health issues in rodents improved after stopping treatment, but hair loss and eye problems did not.

Prolactin affects when mice shed and grow hair.

Testosterone significantly affects sexual desire in both men and women, but its impact on women is more complex and influenced by psychological factors.

Thyroid hormone treatments help thyroidectomized rats grow normally.

Some sports supplements can cause health issues like mood swings, hair loss, and heart problems in men.

Acromegaly can be hard to diagnose in young women with atypical symptoms, and persistent high phosphate levels should lead to growth hormone testing.

Hair loss led to the diagnosis of Cushing's disease in a patient, showing that hair loss can be a sign of hormonal disorders.

Older patients with Cushing's syndrome often have different symptoms and treatment outcomes compared to younger patients.

Children and adults with Cushing's disease show different symptoms and males have more severe cases; surgery outcomes can be predicted by certain factors.

Secondary amenorrhea has many causes and requires thorough evaluation to treat and restore menstrual cycles.

Skin problems can indicate different diseases inside the body.

Dopamine affects coat color changes in agouti mice.

The testes produce important hormones like testosterone and others that play key roles in male body functions.

High prolactin levels can cause skin and hair symptoms similar to those caused by hormone imbalances.

Scalp biopsies are important for diagnosing hair loss conditions.

Activating autophagy in dogs with certain diseases improves their skin and hair.

A 7-year-old boy with a brain tumor developed early puberty, which was successfully treated with medication.

The conclusion is that different types of hair loss in dogs and cats can be cosmetic or serious, and affected animals should not be bred.

A woman's cyclic Cushing syndrome was caused by a tumor in her adrenal gland that produced ACTH.

The desmopressin stimulation test helped identify an adrenal cause for a patient's Cushing's syndrome.

The patient's long-term symptoms were due to Sheehan's syndrome, which improved with hormone therapy.

Long-term treatment with buprenorphine/naloxone for opioid addiction may lead to secondary adrenal insufficiency.

A woman with Sheehan syndrome improved with hormone treatment.

The chapter explains causes of hair loss and excessive hair growth in animals.

Skin symptoms like fragile skin and easy bruising can indicate Cushing's syndrome, which requires early diagnosis and treatment to prevent serious health issues.

Physical symptoms in depression can reveal underlying medical conditions.

The document suggests that male hormones likely affect hair growth and baldness, and future treatments might involve stem cells and androgen-independent cells.