Why my hair are so thin?

Thinning hair can have various causes, including genetic factors, nutrient deficiencies, hormonal changes, stress, and certain health conditions. Some of the reasons for thinning hair are:

1. Hereditary factors (including androgenetic alopecia, male-pattern baldness, and female-pattern baldness)
2. Nutrient deficiencies, such as lacking biotin, zinc, iron, or protein in the diet
3. Hormonal imbalances due to thyroid conditions, menopause, pregnancy, or periods of significant weight loss
4. Stress, which can cause temporary thinning and increased hair shedding
5. Medical conditions, including scalp infections (such as psoriasis), an autoimmune disease (like lupus), and scalp-specific conditions like frontal fibrosing alopecia
6. Poor diet and vitamin deficiencies, especially in iron, folic acid, and zinc
7. Excessive hairstyling or hairstyles that pull the hair tight, like pigtails or cornrows, can cause traction alopecia
8. Poorly managed medical conditions, such as diabetes or lupus, can also affect hair health

Treatments and remedies for thinning hair depend on the underlying cause. For instance, medications, dietary changes, and home remedies like caffeine, garlic gel, onion juice, or procyanidins from apples, cinnamon, and grapes can help, but they may be more effective if the cause is not genetic. If thinning hair is involved in a broader health issue, treatment may focus on addressing the underlying condition. It's advisable to consult a healthcare professional if you're concerned about sudden, unexpected hair loss or significant thinning. Keep in mind that treatments will depend on the diagnosed cause, and some hair loss may be temporary and resolve over time, while genetic or other irreversible causes may require management rather than a complete reversal.