Hot day inner buttocks grinding pain should be treated according to the cause, the possible causes are excessive sweating, dermatitis eczema, hemorrhoids, etc. Treatment includes general treatment, drug treatment, surgical treatment and so on. 1. Excessive sweating: this situation should minimize sweating, keep the local fresh and dry, such as wearing light clothing, not frequent strenuous exercise, keep the living environment and working environment at the right temperature, but also diligent bathing and changing clothes. 2. Dermatitis eczema: may be due to excessive sweating caused by the heat, causing eczema, general treatment refer to the above. In terms of medication, topical glycerine lotion and glucocorticoid cream can be used locally, and chlorpheniramine maleate, loratadine, cetirizine and other drugs can be taken orally. 3. Hemorrhoids: you can take a warm water sitz bath and potassium permanganate fumigation, to help promote the inflammation subside, keep the perianal area clean and prevent infection. Heparin ointment, 5% ichthyol ointment, and hemorrhoid suppositories can also be applied externally to the painful area. Surgery can also be performed if necessary. The above drugs need to be used under the guidance of a doctor. When the inner side of the buttocks grinds painfully when it is hot, if it fails to improve after general treatment, it is recommended to consult a doctor in time.