Contrary to popular belief, having the HIV virus is not the same as having AIDS. In addition to HIV contamination, the diagnosis of AIDS requires the existence of at least one disease caused by immunosuppression. The HIV virus causes immunosuppression because it attacks the immune system. The most affected defense cells are CD4 T lymphocytes. HIV invades these lymphocytes and changes the DNA of cells so that they stop working normally and only produce copies of the HIV virus itself. After multiplying, the virus destroys the infected lymphocytes and returns to the blood in search of others to continue their multiplication. Over time, the number of viruses in the bloodstream becomes steadily increasing as the number of CD4 lymphocytes decreases. This destruction process is very slow and gradual, allowing patients to remain asymptomatic for many years. This means that people can be carriers of HIV for a long time without necessarily developing AIDS disease. A patient is only considered as having AIDS when the HIV virus has attacked and destroyed such a large number of lymphocytes that the immune system is already weakened. With few viable lymphocytes, the body becomes more vulnerable to infections, becoming susceptible to various types of viruses, bacteria, fungi, and even tumors. In fact, the HIV virus itself causes few symptoms. The severity of the disease is in so-called opportunistic infections, which are those that take advantage of the weakness of the immune system to develop. However, in some cases, HIV can also cause symptoms. Soon after the contamination by the virus, we can have a picture called acute HIV infection, which has nothing to do with AIDS. It is a picture similar to any common virus, which is caused by a reaction of the body to the presence of a new virus. In this text, we will talk about the symptoms of acute HIV infection and the symptoms of AIDS. Acute HIV infection We call acute infection by HIV the picture of viral infection that comes days after the patient has been contaminated by the virus. A large number of signs and symptoms may be associated with acute HIV infection.\u00a0Many of these symptoms are non-specific and also occur in other infectious conditions, especially respiratory infections with other viruses, such as colds, flu, mononucleosis, etc. Most patients who become infected with HIV develop symptoms of acute infection.\u00a0The problem is that the picture is so nonspecific, and in some cases so mild, that most patients do not remember having it. The most common symptom of acute HIV infection is fever (38 \u00b0 C to 40 \u00b0 C), which occurs in more than 80% of cases. They are also very common: \tPharyngitis\u00a0without enlargement of the tonsils and without pus. \tRed spots on the skin (\u00a0rash\u00a0) occurring 48 to 72 hours after the onset of fever and usually last between 5 and 8 days.\u00a0This\u00a0rash usually presents as rounded lesions, smaller than 1 cm, reddish, with discrete relief and distributed throughout the body, mainly in the thorax, neck, and face.\u00a0They may also involve soles of the feet and palms. \tEnlargement of lymph nodes (inguinal) mainly in axils and neck. \tJoint pain, muscle, and headache. In 10% of cases, there may also be enlargement of the liver and \/ or spleen, oral, anal or genital ulcers, diarrhea and vomiting (which can lead to a weight loss of up to five kilos). Ulcers appear to be related to the entry point of the virus into the mucous membranes, similar to what occurs in syphilis. Oral ulcers indicate contamination by active oral sex and anal ulcers by passive anal sex. Likewise, there may be vaginal and penile ulcers. There are also described cases of hepatitis, pneumonia, and pancreatitis caused by acute HIV infection. In rare cases, oral or vaginal candidiasis may also occur. Typically, symptoms of acute HIV infection begin 2 to 4 weeks after exposure to the virus. However, cases with up to 10 months have already been described. As can be noted, the symptoms of acute HIV infection are non-specific, common to several other diseases. It is very difficult to establish a diagnosis only by the clinical picture. Therefore, more important than the symptoms themselves is the time interval between the risk behavior (sex without condoms or the sharing of needles) and the appearance of them. In any case, the diagnosis is never closed through the clinical picture since several diseases can have the same symptoms, being necessary to perform the serologies or the virus research for confirmation (read: HIV TEST ). Patients in the acute phase of HIV have very high viral loads and are therefore highly contagious at this time. The picture of acute infection can last up to two weeks, then disappears and HIV is silently lodged in the body for many years. After the acute phase, the viral load (virus count circulating in the blood) drops and stabilizes at low levels. Symptoms of AIDS The end of the acute infection usually coincides with the positivation of the anti-HIV serology, that is, the blood tests for HIV research become positive. HIV attacks and destroys defense cells called CD4 lymphocytes. Acquired immunodeficiency syndrome (AIDS or AIDS) is a picture of immunosuppression caused by low levels of CD4 lymphocytes, which favors the onset of opportunistic infections. We call opportunistic infections those that take advantage of the fall in our immune system to attack us. Opportunistic infections exist not only in AIDS but also in transplant patients, chemotherapy, cancer, or any other condition that leads to immunosuppression. To establish a diagnosis of AIDS, one must be infected with HIV and: 1. have a CD4 lymphocyte count less than 200 cells \/ mm3; or 2. presenting one of the AIDS-defining diseases, which are: \tPulmonary or tracheal candidiasis. \tCandidiasis of the esophagus. \tInvasive uterine cervix cancer. \tDisseminated coccidioidomycosis (fungal infection). \tExtrapulmonary cryptococcosis (fungal infection). \tIntestinal cryptosporiasis (parasitic disease). \tCytomegalovirus (viral disease). \tHIV encephalopathy (brain injury by HIV). \tHerpes simplex chronic (over a month long) or disseminated. \tDisseminated histoplasmosis (fungal infection). \tChronic intestinal isosporiasis (parasitic disease). \tKaposi\\'s sarcoma (AIDS typical neoplasia). \tBurkitt\\'s lymphoma. \tCentral nervous system lymphoma. \tThe infection spread by Mycobacterium avium complex (bacterial infection). \tDisseminated tuberculosis. \tPneumonia by the fungus Pneumocystis carinii (also called Pneumocystis jirovecii ). \tRecurrent pneumonia. \tRecurrent multifocal leukoencephalopathy (a viral disease that attacks the brain). \tSepsis by salmonella bacteria. \tCerebral toxoplasmosis. \tHIV consumptive syndrome (HIV weight loss). Any patient with one of the above diseases is likely to have some immune deficiency, as they are health problems that are not usually found in individuals with a perfect immune system. The diseases listed above are typical of patients with immunosuppression, not necessarily AIDS. Their presence, however, necessarily indicates HIV testing if there is no obvious cause for immunosuppression, such as immunosuppressive drug use or chemotherapy. There is no single clinical picture of AIDS. The clinical presentation will depend on the type of disease that develops and the affected organs. If you ask me what are the symptoms of AIDS, I will respond: - It depends, there are several. The most typical AIDS diseases are esophageal candidiasis, tuberculosis (which in pulmonary form may also occur in people without HIV), Kaposi\\'s sarcoma, cerebral toxoplasmosis, P. carinii fungus and cytomegalovirus. Immunosuppression in addition to facilitating the onset of infections also increases the frequency of malignant neoplasms. Cancers such as the uterine cervix become extremely aggressive and lymphomas are much more frequent in AIDS than in healthy people. Other tumors, such as Kaposi\\'s sarcoma, are typically immunosuppressed, especially in homosexuals. That image of the AIDS patient, cachectic, full of skin lesions and oral candidiasis, is no longer so common. The treatment has come a long way in recent years, and most HIV-positive patients keep their CD4 levels high, preventing opportunistic infections from occurring. Patients are already diagnosed earlier and treatment is usually initiated before advanced stages of the disease. But, attention, HIV still has no cure and still kills. In fact, it is not HIV who leads to death, but opportunistic infections and neoplasias secondary to immunosuppression. It is therefore important to take the antiretroviral cocktail properly to prevent virus multiplication and destruction of CD4 lymphocytes.