The fingernails have a mica-like appearance. Most intestinal parasitic infections are always associated with local hygiene conditions, habits, health awareness, economic level and family aggregation. Natural temperature, rainfall and the production and living habits of people are epidemiologically important factors. Most of them are directly transmitted. Due to poor dietary habits, such as eating raw unsterilized fruits and vegetables, drinking cold water; not washing hands before meals and after defecation, etc. can allow worm eggs to enter the intestinal tract through food, water sources, and eating utensils. Pinworm disease: Pinworms, thread-like and milky white, are small nematodes that live in the intestine and can cause pinworm disease. When a person sleeps, the female worms migrate outside the anus to oviposit in large numbers, and the excluded eggs adhere to the skin outside the perianal area, causing mainly itching of the skin in the anus and perineum, as well as secondary inflammation as a result. In addition, the patient often suffers from irritability, insomnia, loss of appetite, and night terrors. If the female worms lay eggs outside the anus and enter the vagina, uterus, fallopian tubes, urethra or abdominal and pelvic cavities, they can cause vaginitis, endometritis, tubitis and other inflammatory diseases. Pork tapeworm and cysticercosis: Patients also generally have no obvious symptoms, and a few have vague abdominal pain, indigestion, diarrhea, and weight loss. White flakes (nodules) found in the feces are the most common reason for seeking medical attention. Cysticercosis occurs when a person accidentally ingests the eggs of a pork tapeworm and the eggs develop into larvae (cysts) in the human body. Cysticerci are found mainly in the subcutaneous, muscular, ocular and brain tissues. It is much more harmful to humans than tapeworms. Cysticerci that invade subcutaneous or muscular tissues form nodules and cause muscle pain and swelling; parasites in the brain can cause seizures, headaches, dizziness, memory loss, limb numbness, hearing impairment, mental disorders, etc. Parasites in the eyes can cause vision loss or even blindness.