External hemorrhoids touch very painful may be infected, thrombosis and other reasons. 1. Infection: when the external hemorrhoid infection, the formation of inflammatory external hemorrhoids, due to inflammation stimulation, there can be obvious pain, tenderness obvious, can be accompanied by hemorrhoidal nucleus redness and swelling, localized fever, anus secretion and so on the performance of the general need for anti-infective treatment, oral or local antibiotics, such as levofloxacin, erythromycin ointment and so on. You can also use warm water sitz bath or 1:5000 potassium permanganate solution sitz bath, reduce swelling and anti-inflammatory, relieve pain and other inflammatory reactions. 2. thrombosis: due to habitual constipation, eat spicy and stimulating food and other reasons, damage to the local veins in the anus, resulting in thrombosis, local bruising and the emergence of obvious pain, often manifested as severe pain intolerable, palpation obvious, the examination can be found in the anus local subcutaneous thrombosis, this kind of hemorrhoid generally need surgical treatment. Regardless of the cause of the external hemorrhoid obvious pain, need to go to the regular hospital in time, follow the physician’s advice treatment.