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Based on the research, hair loss in IGAN patients can occur due to several factors:

1. Nutritional deficiencies (especially protein, vitamins, and minerals) because kidneys aren't processing nutrients properly
2. Buildup of waste products in your blood when kidneys aren't filtering well
3. Protein restrictions in your diet (which are often necessary with IGAN)
4. Potential side effects of medications

Talk to your doctor about testing for nutrient deficiencies and reviewing your medications. They can help determine the specific cause and recommend safe treatments while managing your IGAN.