### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I am 13 and my weight is 33.5kg This is about human intestine worms, more specifically pinworms, 1. Can they be as small as 1mm?(because i keep itching everywhere on my body) 2. If you see a doctor and got the medicine for it, how to you keep any more unhatched eggs around the house or on your clothes from infecting you again?( cause i went to the doctor before and ate the medicine but somehow my itching got back after a month) 3. Is it a bad thing to have worms inside you? 4. Is there a way to kill these worms by eating something not a medicine(something like orange or lettece)?(cause I really don t want to bother my mum again to take me to the doctor after only just a month) 5. how do you keep other people from getting infected in your family when you have them?(I don t want my mum to get the same thing) 6.does doing sports such as swimming kill them off gradrually?

### output:

Hi Dear, Intestinal worms such as pin worm and thread worm are small but visible to naked eye. It is their eggs which are too small to be seen by naked human eye. These worms lay their eggs at the anal opening at nighttime and cause irritation, leading to itching. When you scratch the anal opening due to itching, these tiny eggs get collected under your nails and when you eat something these eggs get transferred orally to the stomach where they grow into adult worms and the cycle is repeated. To avoid reinfection, keep your nails closely cropped, wash your hands with soap and water regularly, especially after toilet. Do not insert your finger in Chat Doctor. Don't worry your mom will not get the infection. I have no idea of any natural edible substance capable of killing these pests.