Question

When does AIDS occur? What are some of the common signs that the infection has progressed to AIDS?

Answer 1

Short answer
AIDS (acquired immunodeficiency syndrome) is the most advanced stage of HIV infection. It is diagnosed when an HIV‑positive person either (a) has a CD4 T‑cell count < 200 cells/mm3, or (b) develops one or more HIV “AIDS‑defining” illnesses (certain opportunistic infections or cancers), regardless of CD4 count.

More detail — timing and context
- Without effective antiretroviral therapy (ART), HIV typically progresses over years (classically ~8–10 years on average) from initial infection through a chronic phase to AIDS, but timing varies widely between people.
- With modern ART started and taken consistently, most people do not progress to AIDS.

Common signs and symptoms that HIV has progressed to AIDS
Many of the signs are caused by weakened immunity and by opportunistic infections or cancers. Common warning features include:
- Persistent or unexplained weight loss (wasting)
- Chronic, recurrent high fevers and drenching night sweats
- Severe, ongoing fatigue and weakness
- Chronic diarrhea that does not resolve
- Recurrent, severe, or unusual infections (e.g., frequent bacterial pneumonias)
- Persistent swollen lymph nodes (generalized lymphadenopathy)
- Oral or esophageal thrush (Candida white plaques; painful swallowing if esophageal)
- Shortness of breath, cough and fever from Pneumocystis jirovecii pneumonia (PCP)
- Purple or brown skin lesions (Kaposi sarcoma)
- New or progressive neurologic symptoms (confusion, seizures, focal deficits from toxoplasmosis or lymphoma, memory loss)
- Vision changes from CMV retinitis
- Severe fungal or mycobacterial infections (cryptococcal meningitis, disseminated TB, MAC)
- Certain cancers (e.g., non‑Hodgkin lymphoma, invasive cervical cancer)

Laboratory signs
- CD4 T‑cell count consistently below 200 cells/mm3
- High HIV viral load (lack of virologic control) often accompanies progression

What to do if you suspect progression
- See a healthcare provider promptly for CD4 count and viral load testing and evaluation for opportunistic infections.
- If not already on ART, starting or optimizing ART is critical. If already on ART, evaluation for adherence, resistance, or treatment failure is needed.
- Prophylaxis and treatment for specific opportunistic infections may be required (for example, TMP‑SMX prophylaxis against PCP when CD4 <200).
- Seek urgent care if you have severe breathing difficulty, altered mental status, high fever, severe headache with stiff neck, sudden vision loss, or other acute severe symptoms.

If you want, I can list the CDC’s common AIDS‑defining illnesses and the typical symptoms of a few of the most frequent opportunistic infections (PCP, cryptococcal meningitis, CMV retinitis, toxoplasmosis).