There are many causes of alopecia areata, the most common being various infections, such as bacterial and fungal infections. Psychological factors also play a significant role, such as excessive mental stress, frequent anxiety, depression, irritability, etc. Additionally, traumatic injuries can trigger alopecia areata. If there are underlying internal diseases, they can also cause alopecia areata. Hormonal imbalances, especially in women before and after pregnancy due to irregular secretion of estrogen and androgen, can lead to alopecia areata. Therefore, there are various reasons for alopecia areata. If you have patches of hair loss on your scalp, it is advisable to visit a reputable hospital for a check-up to determine the specific cause. Under a doctor's guidance, you might use hair regrowth medications such as compound scytonemin hair tonic or minoxidil solution for treatment. It is also important to avoid staying up late.