Can low iron or anaemia cause erection problems? Neither is a recognised cause — but low iron can lower your sex drive, and too much iron can cause erection problems. Anaemia and low iron are not among the causes of erectile dysfunction that healthdirect lists, and we found no study in men testing whether treating low iron improves erections. Iron overload is different: healthdirect names ED among the early symptoms of haemochromatosis, the inherited condition in which iron builds up in the body.
What does low iron do to sex drive and energy?
It can lower both. healthdirect's list of low-iron symptoms includes feeling tired, listless and weak, being short of breath, dizzy and light-headed, trouble concentrating, and "decreased libido (sex drive)" — adding that other conditions can cause these symptoms too (healthdirect — Iron deficiency). Anaemia, when you don't have enough red blood cells or haemoglobin, can bring fatigue, a fast heartbeat, dizziness, shortness of breath and chest pain, or no symptoms at all (healthdirect — Anaemia). Erection problems are not on either list.
What does the research show?
Very little, and none of it in men with ordinary low iron. In kidney failure, one of the chronic conditions healthdirect links with anaemia, 20 of 25 men on dialysis reported better sexual function after six months of erythropoietin, which raised their haematocrit (the share of the blood made up of red cells); the study had no untreated comparison group (Wu et al., Scand J Urol Nephrol 2001), and in 22 men on dialysis, erection scores were linked with haemoglobin levels (Adnyana et al., Arch Ital Urol Androl 2025). The one study of iron treatment and sexual function we found was in 207 women with iron-deficiency anaemia, whose sexual function scores rose after treatment (Gulmez et al., J Sex Med 2014).
Why does the cause of the anaemia matter more?
Because the cause may be the real problem. For a man, the main causes of low iron that healthdirect gives are too little iron in the diet, trouble absorbing it (coeliac disease, inflammatory bowel disease, bariatric surgery) and blood loss — often bleeding in the stomach or bowel from aspirin or other anti-inflammatory medicines, ulcers, bowel polyps or cancer — so a doctor will arrange tests to look for unexpected blood loss (healthdirect — Iron deficiency). Anaemia can also come from a lack of vitamin B12 or folate, or from chronic conditions such as kidney disease, diabetes, liver disease or an underactive thyroid (healthdirect — Anaemia). Diabetes and an underactive thyroid are both on healthdirect's list of causes of erectile dysfunction, so when ED and anaemia turn up together, a shared cause is worth looking for: ED in men with diabetes, does thyroid function affect testosterone levels? and can low vitamin B12 cause ED?
Can too much iron cause erection problems?
Yes, when it is haemochromatosis. In this inherited condition iron builds up over many years, and healthdirect lists erectile dysfunction among its early symptoms, with loss of libido later; untreated, it can damage organs and cause hypogonadism (testicular atrophy) (healthdirect — Haemochromatosis). It is the most common genetic condition in Australia, symptoms usually start between 30 and 60, and a blood test shows how much iron is in your blood. Treatment includes regular removal of blood (venesection), and people with it are advised to avoid iron supplements, vitamin C supplements and cereals with added iron. If a parent or sibling has it, see your doctor even without symptoms.
Should you take iron tablets for erections?
No — not without a blood test. healthdirect says to see your doctor before taking any iron supplement and to take them only under medical supervision — more than the recommended dose can cause iron poisoning — and the only reliable way to know you are low is an iron study blood test. Iron tablets are taken for several months, and can cause dark stools and constipation (healthdirect — Iron deficiency). If you also take an ED medicine, tell your doctor or pharmacist about vitamins and supplements, as the Viagra and Cialis leaflets ask (Viagra CMI; Cialis CMI).
Can you take ED medicines if you have anaemia?
Anaemia in general is not among the conditions the Viagra and Cialis leaflets rule out, but one kind is flagged: both ask you to tell your doctor if you have sickle cell anaemia (Viagra CMI; Cialis CMI), because it can make priapism — a prolonged, painful erection — more likely (EMA — Viagra product information). An erection lasting more than 4 hours needs the nearest hospital emergency department (healthdirect — Sildenafil). Severe, untreated anaemia can lead to heart problems (healthdirect — Anaemia), and a doctor checks your heart before prescribing an ED medicine, because sex puts a strain on it (Viagra CMI): can heart problems cause erectile dysfunction?
The short answer
Low iron and anaemia are not known causes of ED, though low iron can sap energy and sex drive and its cause needs finding. Too much iron is the one iron problem that does cause ED: haemochromatosis, which a blood test can pick up. Do not take iron tablets without a test. More on conditions and ED medicines in our guide to health conditions and erectile dysfunction.
