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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.

The research suggests that Tourette syndrome is linked to both brain signaling and immune system pathways.

The enzyme 5α-reductase is key in causing psychotic-like effects from sleep deprivation.

Post-finasteride syndrome causes lasting sexual, neurological, and physical side effects in some people after taking finasteride.

Antidepressants might help with skin inflammation and improve conditions like psoriasis and eczema.

17α-estradiol is a safe estrogen that might protect the brain and doesn't cause feminization, needing more research for treating brain diseases.

Scientists identified three genes important for processing certain brain chemicals, thyroid hormones, and medications.

The model showed that randomness accurately describes individual hair growth cycles and that synchronization can cause large fluctuations not seen in humans.

Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

Dog hair grows back in about 14 weeks after being clipped for surgery, and the season doesn't really affect this growth rate.

Melatonin-loaded nanocarriers improve melatonin delivery and effectiveness for various medical treatments.

Finasteride may cause lasting sexual, mental, and physical symptoms; use with caution.

Levodopa for Parkinson's disease might be linked to skin issues like melanoma, but it's unclear if the drug or the disease causes them.

Finasteride raises suicide-linked aggression and stops clozapine's positive effects in schizophrenia animals.

Platelet Rich Plasma (PRP) shows promise for tissue repair and immune response, but more research is needed to fully understand it and optimize its use.

Human skin's melanocytes respond to light by changing shape, producing pigments and hormones, which may affect sleep patterns.

Combining mood stabilizers with antipsychotics is more effective for treating children with bipolar disorder than using mood stabilizers alone.

Most women with excessive hair growth have PCOS; treatment varies and focuses on preventing new hair, with electrolysis as the only permanent removal method.

Finasteride can cause lasting sexual dysfunction, depression, and other side effects, needing more research for treatment.

Using rodents for research shows that health problems in the womb can cause diseases later in life.

Early diagnosis and treatment of PCOS in teenagers can help prevent more severe adult PCOS.

Zebrafish larvae are used to study and find treatments for ear cell damage because they are easier to observe and test than mammals.

Hair loss causes differ between men and women due to changes in hormone levels and inflammation-related pathways.

About 15% of adolescent girls in a region of India have Polycystic Ovarian Syndrome, which is more common in those born by cesarean, with wisdom teeth, or with central obesity.

Women with moderate body hair have higher levels of certain hormones and may benefit from treatment that increases sex hormone-binding protein.

The health of the gut may be important in developing new ways to prevent, diagnose, and treat alopecia areata.

5-alpha reductase inhibitors can cause sexual, neurologic, endocrine, and cardiovascular side effects, but these are rare and usually stop after ending treatment.

Drug metabolism affects how long a drug works, its interactions, activation, and toxicity, and is influenced by genetics, diet, illness, and other drugs.

Sebum production varies by individual and is influenced by age, gender, and hormones, affecting skin and hair health.

Toxoplasma gondii infection may increase testosterone levels in males.