There are four categories to the medical grounds of inadmissibility during an immigration medical examination.
Communicable diseases: Immigrants with a communicable disease that is a public health risk are inadmissible to the United States, so in order for these germs to be passed down from very few people to a lot of people, a person will touch something with germs on it before you touch it.
If the applicant has a positive HIV test, a waiver may be filed. Also, the applicant must prove that: Admits will pose : negligible public health risk; entail negligible risk of transmission; will not involve costs for which he or she has not been approved by a health agency before the alien’s admission as a nonimmigrant, unless the alien demonstrates that the failure to obtain the consent was reasonable.
Cancroids (STDs are venereal sores, but unlike syphilis, cancroids are soft )
Granuloma inguinale (STD, donovanosis, STD causes the flesh’s own medications to be rejects out of the human’s body.)
Lymphogranuloma (STD chlamydia is an STD infection of the lymphatic system.)
Not having one of the vaccinations that the U.S. requires immigrants to take such as: measles , mumps, rubella, polio, tetanus and diphtheria toxoids, pertussis, Haemophilus influenzae type B, Hepatitis A, Hepatitis B, Rotavirus, Meningococcal disease, Varicella , pneumococcal, influenza , and any other vaccine recommended by the Advisory Committee for Immunization Practices , can be grounds that you’re inadmissible.
Examples include physical or mental disorders with associated harmful behavior, such as substance abuse or bipolar disorder and schizophrenia, that are likely to result in the harmful behavior.
Medical folks think that if you have had drug and alcohol use in the past, your chances of this being a repeat is high. Consequently, you are inadmissible.
It should be noted that these breakdowns are based on US immigration law and will vary by country of origin and destination. It it also important to keep in mind that any of these cases can be appealed and looked at individually and in many cases there may be exceptions available or waivers available.