Common parasites include roundworms, hookworms and amoebas. It can cause skin itching, wasting, diarrhea and other hazards. 1. Itchy skin: for example, hookworms and other parasites can cause itchy skin, which mostly occurs between the fingers and toes, the edge of the foot, the skin of the lower limbs or buttocks, resulting in red dotted blisters and papules, itchy. If the skin is scratched, it can form pustules secondary to bacterial infection. 2. Wasting: for example, roundworms, parasites in the intestine will compete for nutrients, leading to the body’s nutritional supply, resulting in body wasting and anemia symptoms. 3. Prolonged diarrhea: for example, amoeba will secrete toxins, resulting in abdominal pain, diarrhea, stools several times a day to more than 10 times, with a fishy smell, with dark red mucus blood stools. Symptoms can last for months to years and may include anemia, fatigue, abdominal discomfort, and changes in bowel habits. When the above symptoms occur, it is recommended to consult a doctor for further examination as prescribed by the doctor, to clarify the cause with the help of the doctor, and to carry out targeted treatment or therapy.