When patients experience severe oral ulcers, it is generally not recommended to take acyclovir tablets, because acyclovir is used to treat symptoms caused by some viral infections. If the disease is caused by viral infections, acyclovir can be taken orally. When oral ulcers occur, they are generally caused by "internal heat" in the patient's body, possibly due to a decrease in resistance, leading to local mucosal ulceration, bleeding, and pain in the mouth. When patients have low resistance, it is suggested that they adjust their resistance appropriately, eat more fresh vegetables and fruits, ensure adequate rest, drink plenty of water, and adjust their lifestyle appropriately without overeating or drinking. Oral ulcers and acyclovir are not closely related, so it is advised not to take acyclovir tablets when oral ulcers occur. (Medication should be administered under the guidance of a physician.)