The number one cause of low iron is bleeding in the stomach and intestines.
Bleeding in the stomach and intestines can be caused by bowel cancer, stomach cancer or stomach ulcers, or even by taking non steroidal anti inflammatory medications also known as NSAIDs.
But in men and post menopausal women, the most common cause of low iron in the body is bleeding in the stomach and intestines.
However other things can also cause low iron.
Bypassing or removing intestinal tissues, which help take in iron and other nutrients also raises a person's risk of iron deficiency anemia.
And people that have certain conditions, which affect digestion, like celiac disease, bowel disease, like ulcerative colitis and Crohn's disease, peptic ulcers and kidney disease are also at risk of low iron in the body.
Low iron in the body, which is also known as iron deficiency is when the body's iron stores are too low.
Other common causes of low iron or iron deficiency include not getting enough iron in your diet, chronic blood loss, pregnancy and even vigorous exercise.
And even some foods and drinks affect how much iron your body absorbs.
Anemia, especially iron deficiency anemia, can and does very commonly cause headaches, as the lack of red blood cells or hemoglobin means less oxygen reaches the brain, which leads to concentration issues, fatigue and headaches or migraines.
A study showed that nearly 80 percent of people with iron deficiency experienced headaches.
The headaches with iron deficiency anemia can range from mild to severe, and sometimes feel like migraines, often linked to low iron affecting brain chemicals like serotonin, and are also treatable with iron supplements and proper diet.