A simple lemon can help treat the following diseases: varicose veins; cough; hiccups; colds and flu; problems related to pregnancy; oily skin; dark spots; pediculosis; greasy hair; warts; unpleasant body odor; laryngitis; sore throat; herpes; dry mouth; morning symptoms of nausea during pregnancy; angina; stones in the kidneys; calluses; sunburn; acne.