A primary care physician (Family Medicine) or Internal Medicine is usually the best starting point because symptoms like fatigue, dizziness, cramps, or hair loss have broad differential diagnoses. If iron-deficiency anemia is confirmed and the cause is unclear, Gastroenterology (occult bleeding/malabsorption) or Gynecology (heavy menses) may be involved. Suspected malabsorption typically points to Gastroenterology; kidney-related electrolyte issues to Nephrology; endocrine regulation problems (thyroid/parathyroid) to Endocrinology. A registered dietitian can substantially improve long-term success by building sustainable dietary solutions. In short: start with primary care/internal medicine, then escalate based on the identified cause.\n\nSource note: Clinical routing principles consistent with mineral deficiency management frameworks (NIH ODS).