You should consult a doctor, preferably a dermatologist or trichologist, for a detailed scalp examination to assess common causes such as genetics (androgenetic alopecia), severe stress, hormonal changes, or nutritional deficiencies. Blood tests, such as a complete blood count, thyroid function, iron, ferritin, vitamin D, and vitamin B12, may be advised to detect reversible causes. In the meantime, follow gentle hair care practices, use a sulphate-free shampoo, and avoid tight hairstyles or excessive heat and chemical treatments. Depending on the cause, treatment may include adequate nutrition and medications such as topical minoxidil or oral finasteride, if advised by your doctor.