Iron deficiency can show up in surprising places long before a blood test confirms it. If you’re not feeling quite yourself—even with normal energy levels or no obvious pale skin—your mouth, cravings, legs at night, and sure, even sounds in your ears might be nudging you to check iron. Medical experts have documented several unusual clues that are easy to overlook, and spotting them early can make a real difference. Here are five less obvious symptoms to watch for.
Restless legs at night
Restless legs syndrome (RLS) often appears alongside low iron. Medical sources note that iron deficiency can trigger an irresistible urge to move the legs, especially after lying down to sleep. This can disrupt rest and leave you feeling tired during the day. In some cases of iron deficiency anemia (IDA), symptoms improve markedly after starting iron therapy.Pulsing sounds in the ears
Pulsatile tinnitus is another lesser-known sign. This condition makes you hear a rhythmic whooshing, buzzing, or ringing that seems to move with your heartbeat. The Cleveland Clinic explains this can occur when there’s faster-than-usual blood flow near the ears, a situation that can occur with anemia. Hearing your own pulse is a common clue in these cases.Pica, especially pagophagia
Pica—the craving for non-nutritive substances—can be a striking indicator of low iron. People may crave ice, dirt, clay, or paper, with ice chewing (pagophagia) being the most common. The NIH notes a strong link between pagophagia and iron deficiency anemia, including cases where subtle pica behavior emerges alongside severe anemia.A painful or unusually smooth tongue
An early sign can be tongue changes: a swollen or unusually smooth tongue. Research cited by the National Library of Medicine shows people with anemia often report longer-standing tongue discomfort compared to those with iron deficiency alone. The NHS also lists a sore tongue as a recognized symptom, noting that inflammation can erase the tongue’s grooves, leaving it redder and smoother than typical.Hair shedding and thinning
Iron deficiency can disrupt the normal hair growth cycle. A 2023 Taiwanese study referenced by Medical News Today found iron deficiency implicated in about 70% of female alopecia cases. The underlying mechanism involves iron’s role in producing hemoglobin, which delivers oxygen for growth and repair, including hair follicle cells. Over time, this can lead to noticeable thinning or shedding.
If these signals show up alongside other symptoms like fatigue, pale skin, or brittle nails, it’s worth discussing iron status with a healthcare professional. Early detection and treatment can help reverse or reduce these effects.
