What causes hemoglobin to fall to 7 in a woman?

A hemoglobin level of 7 g/dL in a woman can be caused by several factors, including iron deficiency anemia, chronic blood loss (such as from heavy menstrual periods or gastrointestinal bleeding), nutritional deficiencies (like vitamin B12 or folate), or chronic diseases (such as kidney disease or cancer). Other potential causes include bone marrow disorders or hemolytic anemias, where red blood cells are destroyed faster than they can be produced. It's essential for the individual to seek medical evaluation to determine the underlying cause and appropriate treatment.