HS and Anemia: Understanding the Connection
Chronic inflammation from HS disrupts iron metabolism and red blood cell production, making anemia one of the most common and underrecognized comorbidities of hidradenitis suppurativa.
Medical Disclaimer: This article is for educational purposes only. Anemia requires diagnosis and management by a qualified physician. Do not self-diagnose or self-treat. Read full disclaimer.
Fatigue is one of the most common and debilitating symptoms reported by people with hidradenitis suppurativa. While pain management, sleeplessness, and the psychological burden of chronic illness all contribute to fatigue in HS, there is another frequently overlooked cause: anemia.
Research shows that anemia affects a significant proportion of HS patients, yet it is rarely screened for or discussed in the context of HS management. Understanding the connection between HS and anemia - and knowing what to ask your physician - can make a meaningful difference in your energy levels and quality of life. Patients with HS and metabolic comorbidities like diabetes may face compounded risks.
Key Takeaway
If you have HS and experience persistent fatigue, shortness of breath, or dizziness that seems disproportionate to your disease activity, ask your physician for a complete blood count (CBC) and iron studies. Anemia is treatable, and addressing it can significantly improve your quality of life.
Two Types of Anemia in HS Patients
HS patients are at risk for two distinct types of anemia, which can occur independently or simultaneously. Understanding the difference is important because the treatment approaches differ.
Anemia of Chronic Disease (ACD)
Also called Anemia of Inflammation
- - Caused by persistent systemic inflammation
- - Inflammatory cytokines (IL-6, TNF-alpha, IL-1) disrupt iron metabolism
- - Hepcidin, an iron-regulatory protein, is elevated - blocking iron release
- - Red blood cell production is suppressed
- - Most common type in HS patients with active disease
- - Best treated by controlling HS inflammation
Iron Deficiency Anemia (IDA)
From Chronic Blood Loss
- - Caused by chronic blood loss from draining HS lesions
- - Repeated wound drainage depletes iron stores over time
- - Can occur alongside ACD, making diagnosis complex
- - Iron stores (ferritin) are low
- - Responds to iron supplementation
- - Controlling HS disease activity reduces ongoing blood loss
The distinction matters clinically because giving iron supplements to someone with pure ACD may not help and could cause harm. Accurate diagnosis requires blood tests interpreted by a physician.[5]
Symptoms of Anemia in HS Patients
The challenge for HS patients is that many symptoms of anemia overlap with HS itself - fatigue, reduced activity tolerance, and difficulty concentrating are common to both. This overlap can cause anemia to go unrecognized for years. The following symptoms, particularly if they seem disproportionate to your current HS disease activity, should prompt a conversation with your physician:
Blood Tests to Request
Anemia is diagnosed through blood tests. If you have HS and suspect anemia, ask your physician for the following panel. These tests are standard, inexpensive, and provide a complete picture of your iron status and red blood cell health.
| Test | What It Measures | Why It Matters |
|---|---|---|
| Complete Blood Count (CBC) | Red blood cell count, hemoglobin, hematocrit | First-line test to confirm anemia |
| Serum Ferritin | Iron storage protein | Low ferritin = iron deficiency; high ferritin = inflammation (ACD) |
| Serum Iron | Iron circulating in blood | Low in both IDA and ACD |
| TIBC (Total Iron Binding Capacity) | Transferrin capacity to carry iron | High in IDA, low/normal in ACD - helps distinguish the two |
| Transferrin Saturation | % of transferrin bound to iron | Low in IDA; may be low-normal in ACD |
| C-Reactive Protein (CRP) | Systemic inflammation marker | Elevated CRP supports ACD diagnosis; tracks HS disease activity |
Treating Anemia in HS Patients
Control HS Inflammation First
For anemia of chronic disease, the most effective treatment is controlling the underlying HS. Effective biologic therapy (such as adalimumab or bimekizumab) reduces systemic inflammation, normalizes hepcidin levels, and allows the body to resume normal iron metabolism and red blood cell production. Many patients see improvement in anemia markers as their HS responds to treatment.
See HS Treatment OptionsIron Supplementation
For iron deficiency anemia confirmed by low ferritin and transferrin saturation, iron supplementation may be prescribed. Oral iron (ferrous sulfate or ferrous gluconate) is first-line. Intravenous iron infusion may be used for patients who cannot tolerate oral iron or have severe deficiency. Do not self-supplement with iron without physician guidance - iron overload is harmful.
Dietary Iron Optimization
While diet alone cannot correct clinical anemia, optimizing dietary iron intake supports treatment. Heme iron (from red meat, poultry, fish) is most bioavailable. Non-heme iron (from legumes, leafy greens, fortified cereals) is enhanced by consuming vitamin C alongside it. Avoid consuming calcium-rich foods or coffee/tea with iron-rich meals as these inhibit absorption.
See Nutrition and Lifestyle Guide