Other than through a medical test, you can't.

http://aids.about.com/cs/conditions/tp/signs.htm 1) Depression Everyone has had days where they were feeling a little "blue". We all have been "down in the dumps" or felt "blah" But when these feelings last longer than a couple weeks you may be suffering from depression. More: What can be done about depression? 2) Diarrhea Diarrhea can be a life threatening problem if not treated correctly and rapidly. But what can you do about this nagging problem? Take a look. More: How to combat diarrhea. Sponsored Links 3) Thrush We have all had morning mouth...that stale, pasty, bad tasting yuk that coats your mouth each morning. But never fear because with one good brushing, your mouth is as fresh as a daisy. But what if the bad taste and and white coating doesn't go away with a simple brushing? Then you may have the most common HIV opportunistic infection...thrush. More: What is it and what can be done? 4) Weight Loss Weight loss is a common problem in HIV and AIDS. Unless you are actively trying to lose weight by exercising and watching what you eat, weight loss is a serious problem. More: Keeping the pounds on. 5) Lipodystrophy People infected with HIV are living longer and more productive lives. A large part of the reason is the introduction of medication combinations into standard HIV care. But with the benefits of medications also comes some unforeseen problems. One such problem is fat redistribution syndrome or lipodystrophy. More: How to get rid of that belly? 6) Lactic Acidosis This emerging problem can make you sick, miserable, and can even be fatal. But what is lactic acidosis? More: Learn about this dangerous problem. 7) Sinus Infections Your head feels congested and full. The pressure behind your eyes makes it hard to concentrate. The pounding in your head and face is relentless. The dreaded sinus infection. More: What to do about that headache. 8) Fatigue Fatigue is a common problem in HIV and AIDS. To treat fatigue, one must decide what is causing the problem. More: Improve your energy level. 9) Nausea / Vomiting Nausea is not only aggravating and can make you feel sick, when associated with vomiting it can be dangerous. More: Let's settle that stomach. 10) Burning and Tingling of the Feet and Hands That burning in your feet can be very painful. But why do you have this and what can be done? More: Get rid of that neuropathy. http://www.youandaids.org/About%20HIVAIDS/Symptoms/index.asp * Lack of energy * Weight loss * Frequent fevers and sweats * A thick, whitish coating of the tongue or mouth (thrush) that is caused by a yeast infection and sometimes accompanied by a sore throat * Severe or recurring vaginal yeast infections * Chronic pelvic inflammatory disease or severe and frequent infections like herpes zoster * Periods of extreme and unexplained fatigue that may be combined with headaches, lightheadedness, and/or dizziness * Rapid loss of more than 10 pounds of weight that is not due to increased physical exercise or dieting * Bruising more easily than normal * Long-lasting bouts of diarrhoea * Swelling or hardening of glands located in the throat, armpit, or groin * Periods of continued, deep, dry coughing * Increasing shortness of breath * The appearance of discoloured or purplish growths on the skin or inside the mouth * Unexplained bleeding from growths on the skin, from mucous membranes, or from any opening in the body * Recurring or unusual skin rashes * Severe numbness or pain in the hands or feet, the loss of muscle control and reflex, paralysis or loss of muscular strength * An altered state of consciousness, personality change, or mental deterioration * Children may grow slowly or fall sick frequently. HIV positive persons are also found to be more vulnerable to some cancers. And remember, these are also indicators for many other problems that could be wrong. One of the best ways to check is by having a doctor take a blood test. It is a virus that can be very hard to detect.

http://www.cdc.gov/hiv/topics/surveillance/resources/software/apids/index.htm Want to ease your mind: The AIDS Public Information Data Set contains information about AIDS cases reported to state and local health departments since 1981. It does not include cases of HIV infection that have not yet developed into AIDS. These agencies share this information with the Center for Disease Control on a voluntary basis, under an assurance of confidentiality. The CDC compiles this database every year. The data set includes individual records for each AIDS patient and summary information by state, metropolitan area, mode of exposure to HIV, sex, race/ethnicity, age, vital status and case definition category. Names and other identifying information are not included.

You can't. Short of reading their laboratory results. That is the only way to be certain that their symptoms are aids HIV related.

Unless they are in advanced stages with open sores, perpetual pnemonia, etc., you cannot tell, especially if they are only HIV and not having full blown AIDS.

If they tell you they do.

A blood test.

You absolutely cannot. Many people who have been HIV positive, who are staying healthy and taking their meds, have the level of the virus reduced down, so the physical symptoms people were used to seeing before the new drugs < HAART > have not or don't develop, also HIV positive people often take hormones to stay healthy and then workout and are sometimes the healthiest looking, men can appear most muscled, healthy looking individuals you have seen. Always at least a condom, and suggest get tested together. matt

By reading their test results

When they've given it to you.

You can't..unless they tell you.

Ask if they like it up the butt