The pins and needles sensation in the anus is usually caused by diseases, and there are several specific causes. First, it may be caused by anal fissures. When patients become constipated, it will cause the surface of the anal canal tissue to crack and form ulcers, which in turn will lead to periodic pain, and there may also be blood in the stool. The tingling sensation in the anus is also related to the depth and size of the fissure. Secondly, external hemorrhoids can also lead to a stinging sensation. When you have external hemorrhoids, you will have a restricted lump at the edge of the anus that is hard and painful to touch. The patient has a superfluous flap at the edge of the anus, which makes it difficult to wipe the anus clean after a bowel movement. The itching and stinging of the anal skin is often caused by the irritation caused by secretions and feces. The main reasons for the anal tingling sensation are as follows. If the patient eats too spicy and stimulating food, it will also lead to a stinging sensation in the anus.