Rectal itching is unpleasant. Often associated with hemorrhoids, rectal itching also occurs in the absence of any readily recognizable reason for the uncomfortable condition. A variety of over-the-counter medications exist for rectal or anal itching, most including zinc oxide as an ingredient, according to MayoClinic.com. Different home or natural remedies exist, thought to control or resolve rectal itching. On the list of these remedies is garlic. No authoritative studies exist supporting the effectiveness of garlic as an effective treatment for rectal itching. In addition, consult your doctor before using any type of alternative treatment for a condition like rectal itching.