You get tested. Testing is the only reliable way to detect HIV.
You 99.9% know when you have HIV when you get an initial HIV test. A positive result will prompt a more formal Western Blot test after which, you will 100% know.
There are no tell-tale symptoms associated with HIV infection. Some people contract a sort of seroconversion sickness about two weeks after contracting HIV from unprotected sex or needle-sharing. Symptoms are virtually identical to the common cold or flu. Thus, it is an unreliable indicator of HIV. And if you ARE using this as an indicator, it's too late to do anything but get a more formal test.
However, there is something called post-exposure prophylaxis. After you are exposed to HIV through unprotected sex or needle sharing/needle stick (WITHIN 72 HOURS), you can take a course of antiretroviral medications (usually, tenofevir and kaletra) religiously for 30 days straight. If you actually had HIV in your body from that exposure (which is usually unlikely), 80% of the time this works. ****NOTE: While post-exposure prophylaxis is available in some countries for free (e.g. the UK), in the US, it can cost as much as $1200.
Long story short -- always use condoms, and certainly don't have sex with people you know to have HIV without using a condom. And there is really no need to share needles, they are virtually free.
You can't tell without a blood test. If you have had unsafe sex (that is, without a condom) then you should get a test. Your doctor, or the local hospital, or a hospital in another town, can organise this for you. Check the price first, because you can order a $60 Home Test Kit in the US (Only one is recommended by the FDA). See the link below. You send a drop of your blood off to their laboratories and they mail you the result. If you do the test with a doctor or a hospital, they will be able to provide advice and counselling. They will also talk to you about an ongoing course of medication which will keep you problem free for years. Depending on where you live, you should be able to get this medication. The HIV virus, which may lead to AIDS if untreated, is spread by sharing needles and by sexual intercourse. So to avoid HIV, you should never share injecting needles (get a new one, or make sure the old one is REALLY sterile), and you should always use a condom when having sex. HIV usually can't be spread by oral sex. The virus has to pass into your bloodstream. If you have terrible teeth and your gums are all bleeding then you shouldn't be sucking any strange penises. HIV CAN'T be spread through toothpicks, razors, toothbrushes, cutlery, plates, glasses etc. It can't be spread through kissing or masturbation.
You would not have any signs and symptoms from HIV in 30 days. It is doubtful from what you are describing you have HIV. Go to your doctor and have yourself checked out. You will feel a lot better.
You will know that you have hiv if you get tested and it comes out positive
Even if just suspicious or in doubt, it would be best to go for check up.
you know that by seeing the signs and symptoms of HIV
IF YOU have been ever told its signs and symptoms
You can determine if you have or do not have HIV by taking an HIV test.
No, you will not be infected in that manner.
You can't, you can't. Be clear on this; you CANNOT tell. Don't let anyone fool you into thinking there is some kind of "method". Even if you ask and the person answers honestly, you cannot tell. Very few HIV+ people become infected intentionally, so that they know instantly when they should start answering the question "yes". Be cautious and remain safe. You can't do a "re-take" after becoming HIV+. See link to left. First things first: IT IS IMPOSSIBLE TO BECOME INFECTED WITH AIDS. AIDS is simply a syndrome that develops as a result of advanced HIV infection. The only way to tell if someone is infected with HIV is for him, or her, to take an HIV test .. and the only way for you to tell if you are infected with HIV is for you to take an HIV test.
They look for the bodies antibodies that fight HIV infection to tell if a person is infected with the virus.
HIV-positive means you are infected with the human immunodeficiency virus. HIV-negative means that you are not infected with the HIV.
In order to contract HIV from blood, it must be infected with the virus. Otherwise, you will not contract HIV.
You can not be infected with HIV though casual contact.
Chances are low to be infected with HIV in this manner.
The chances of getting infected with HIV by ingestion of HIV-infected blood is very small.
If you are infected with chlamydia, you will be more likely to be infected with HIV, if exposed.
Not sure if I understand your question. But, the answer is no you cannot get HIV from smoking anything.
No. HIV is not transmitted via casual contact.
You can't get infected with HIV from someone coughing on you.