Greasy, fine and thinning hair can be caused by heredity, seborrheic alopecia and other reasons. 1. Heredity: If your parents’ hair is greasy, limp and thinning, then your hair may be greasy, limp and thinning due to hereditary factors. 2. Seborrheic alopecia: Seborrheic alopecia is also known as androgenic alopecia, the initial symptoms can be manifested as greasy scalp, fine and soft hair, etc. If the patient is not treated in time, often stay up too late, eat too much spicy and stimulating food, it may lead to the top of the head and frontal hair will gradually thinning. It is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment or therapy with the help of a doctor.