References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
HIV can affect the blood in several ways, from anaemia (low red blood cells) to low platelet counts and white blood cell changes. Some of these are caused by the virus itself, others by medications, and some by related infections. With modern treatment, serious blood problems are much less common than they used to be, but it’s still important to understand the basics.
Here’s what can happen, why, and how it’s managed.
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Common Blood Problems in HIV
| Problem | What It Means | Common Causes in HIV |
|---|---|---|
| Anaemia | Low red blood cells — tiredness, breathlessness | HIV itself, zidovudine, chronic disease, B12/folate deficiency |
| Thrombocytopenia | Low platelets — bruising, bleeding | HIV-related immune destruction, bone marrow effects |
| Neutropenia | Low neutrophils (a type of white blood cell) | Some ART drugs, infections, bone marrow suppression |
| Lymphopenia | Low lymphocytes (including CD4 cells) | HIV itself — the defining feature of the disease |
Anaemia and HIV
Anaemia is the most common blood problem in HIV. It can make you feel tired, weak, short of breath and generally run down. Causes include:
- HIV directly affecting bone marrow
- Chronic inflammation
- Iron, B12 or folate deficiency
- Older drugs like zidovudine (now rarely used in the UK)
- Opportunistic infections
Treatment depends on the cause — often starting or optimising ART resolves HIV-related anaemia. Iron or vitamin supplements may help if deficiency is the issue.
Low Platelets (Thrombocytopenia)
HIV can cause immune-mediated destruction of platelets, similar to immune thrombocytopenia (ITP). Symptoms include easy bruising, petechiae (tiny red dots), and in severe cases, bleeding. Starting or optimising ART usually improves platelet counts. Rarely, additional treatment may be needed.
When to Seek Help
- Persistent unusual tiredness
- Unexplained bruising or bleeding
- Frequent nosebleeds or bleeding gums
- Shortness of breath on exertion
- Very pale skin
- Recurrent infections
Monitoring
Your HIV clinic runs a full blood count at every routine visit. This picks up anaemia, platelet problems and white cell changes early. If anything is trending in the wrong direction, your team can investigate and act before symptoms develop.
Read more: What is HIV? | HIV and the immune system | Lymphoma and HIV
Frequently Asked Questions
Does HIV always cause anaemia?
No. Many people with well-controlled HIV on modern treatment have completely normal blood counts. Anaemia is more common in untreated or advanced HIV.
Can my medication cause blood problems?
Some older HIV drugs (especially zidovudine) can suppress bone marrow. Modern regimens rarely cause significant blood count changes. Your clinic monitors this routinely.
Will starting ART fix my blood counts?
In many cases, yes. Starting effective treatment allows the immune system and bone marrow to recover, often resolving HIV-related anaemia and low platelets.
Related reading
- A to Z of Sex: Sexual Health Terms Explained
- Alcohol and HIV: What You Need to Know
- Anxiety and HIV: Coping and Getting Support
- Are All STIs Curable?
- Can HIV Be Cured? Where the Science Stands
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
