Allium cepa covers more symptoms of common cold than any other remedy, as the well-known effect of onions in producing tears would suggest. It will cure a large proportion of cases of cold in the head, but the conditions which most particularly indicate it are: Cough, or cold, or headache < in warm room, > in open air, < again on returning to warm room. It causes burning of eyelids, nose, mouth, throat, bladder, skin. Inflammation and increased secretion of mucous membranes: neuralgic pains like a long thread; in face, head, neck, and elsewhere; < evening; towards ear from deep within head. The toothache of Cepa is > by cold air or cold washing. It is suited to traumatic neuritis. Hurts do not heal. The feet are easily galled by walking. It was recommended by Dioscorides as a remedy for this condition, and homoeopathy has confirmed his observation. Desire for raw onions is an indication for it. Thread-like pains are common in various parts and are characteristic of Cepa. Thread-like pains in face. Left-side facial paralysis has been cured by Cepa. The cough of Cepa is caused by tickling in larynx; constant inclination to hack in order to relieve it. It has cured violent catarrhal laryngitis; hoarse cough with feeling as if it would split and tear the larynx, causing watering of eyes. Cough from inhaling cold air. Cepa has yawning and drowsiness. A raw onion eaten just before going to bed is a popular remedy for sleeplessness. Cepa is a left-side medicine primarily. Symptoms go from left to right. Left eye; left facial paralysis; left inguinal ring. Rest <; motion >. < Afternoon and evening; when lying down. Damp cold wind and weather = colds and toothache. But cold water and open air >; warm room < Picking or sucking teeth > toothache. Eyes sensitive to touch.