Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for chest pain, severe difficulty breathing, fainting, confusion, or other sudden and severe symptoms.
Contact a healthcare professional sooner if there is new bleeding, black or bloody stool, unusually heavy menstrual bleeding, unexplained bruising, fever, weight loss, or a major change in health.
Seek urgent care for significant shortness of breath, a very fast heartbeat, worsening weakness, or near-fainting.
Follow-up usually includes repeat blood counts and review of the underlying condition.
The timing depends on the severity of anemia, symptoms, treatment changes, and whether hemoglobin is stable.
Arrange routine follow-up if fatigue, reduced exercise tolerance, dizziness, or other possible anemia symptoms are persistent or worsening.
And for anyone, someone who:
The article also says
Clinicians may repeat iron studies or other tests if anemia worsens or does not improve as expected.
People receiving iron, an ESA, chemotherapy, dialysis, or treatment for active inflammatory disease may need more structured monitoring.
Every sign above is quoted from the sofidex article on Anemia of chronic disease. If you are not sure, err upward — it is always reasonable to be checked.