I have iron and B12 deficiencies and can't take supplements because they upset my stomach.

Make an appointment with the clinician who follows you and share which supplements you used, the stomach symptoms you experienced and any lab results you have. Your doctor will assess the situation and decide which specialists or tests are appropriate.

• Note when side effects or symptoms began and exactly what you experienced.
• Bring previous blood test results (for example hemoglobin, ferritin, B12).
• Record the name of any products you stopped, their dose and how long you used them.

If you have emergency or severe symptoms (for example severe shortness of breath, fainting, intense abdominal pain, or bloody stools), go to emergency care immediately.

Typically your primary care clinician evaluates you first and refers to specialists if needed. The following specialties are commonly helpful:

• Family Medicine / Internal Medicine: general assessment and initial coordination of care.
• Hematology: monitoring blood values and investigating causes of deficiency.
• Gastroenterology: evaluation of stomach or intestinal symptoms, malabsorption or gastrointestinal bleeding if suspected.
• Dietitian/nutritionist: advice on diet and food-based ways to increase iron and B12 intake.

Your doctor will prioritise referrals based on your symptoms and test results.

Your doctor will tailor evaluation to your situation. Common elements in follow-up may include repeat blood tests and tests to investigate absorption or sources of blood loss. These help identify causes and guide safe alternatives.

• Repeat laboratory monitoring of blood values.
• Gastrointestinal evaluation and tests if malabsorption or bleeding is suspected.
• Discussion of alternative formulations or routes of administration with your clinician (for example liquid iron, different iron salts, or parenteral options).

Any decision about interventions or treatments must be made by the clinician evaluating you; this page does not give medical treatment instructions.

Low-risk measures can help maintain well-being while you and your clinician plan further steps. These do not replace medical treatment but may support you during follow-up.

• Ensure adequate rest and hydration.
• Include iron- and B12-rich foods in your diet (for example lean meats, legumes, green leafy vegetables, dairy products and fortified foods).
• See a dietitian for a personalized nutrition plan and symptom management.

These suggestions are for general information; discuss individual advice with a healthcare professional.