A Doctor Directory: Allergest : Treats allergies. Anesthesiologist : Puts patients to sleep before surgery. Cardiologist : Treats heart ailments. Dermatologist : Treats the skin and its diseases. Endocrinologist : Treats the glands, such as the thyroid and adrenal, which secrete body hormones. Gastroenterologist : Specializes in diseases and disorders of the digestive system. Gerontologist : Treats diseases of old age. Gynecologist : Treats the female reprodictive system. Hematologist : Treats blood diseases. Immunologist : Specializes in the body's defense system against infection and disease. Nephrologist : Treats kidney disorders. Neurologist : Treats the nervous systems. Obstrician :A doctor who cares for women throughout pregnancy. Orthopedist :Treats disorders of bones and muscles. Orthodonist :A dentist who specializes in straingthening teeth. Otolaryngologist :Treats ailments of the nose, throat and ears. Pathologist :Studies the cause,development and manifestations of disease. Pediatrician :Specializes in the care and treatment of infants and children. Plastic Surgeon :Repairs,restores or improves body parts. Psychiatrist :Treats illness and disorders of the mind. Radiologist :X-rays body parts and organs for medical diagnosis. Rheumatologist :Treats diseases of body joints. Urologist :Treats the urinary tract of the body.