1. Hair is too greasy: This may be caused by excessive consumption of greasy food, lack of exercise, or excessive pressure in life. Greasy hair may also be related to endocrine disorders, such as too much androgen or too little estrogen.
2. Hair is too dry: This may be due to the lack of moisture or the use of too many chemicals to treat hair, such as hair dye and perm. Dry hair may also be related to lack of vitamins A, B, C, E, etc.
3. Hair thinning: This may be due to genetic factors or changes in hormone levels, such as high androgen levels or low estrogen levels.
4. Hair turning white: This may be due to the growth of age, or long-term stress, malnutrition and so on. Hair whitening may also be related to melanin deficiency, such as tyrosine deficiency.
5. Hair loss: This may be due to excessive mental stress, irregular work and rest, or excessive use of chemical hair dyes. Hair loss may also be related to endocrine disorders, such as too little androgen or too much estrogen.
It should be noted that these relationships are not absolute, and everyone's situation is different. If you find hair problems, it is recommended to consult a doctor or dietitian to learn how to improve hair health.