There’s no scientific or clinical evidence that hyperthyroidism (overactive thyroid) causes significant bruising or bleeding problems. In some rare cases, autoimmune forms of hyperthyroidism, like Graves’ disease, may be associated with easy bruising. Research on the link between hyperthyroidism and bruising is limited.
In some people with Graves’ disease, the immune system may mistakenly attack platelets. This is known as immune thrombocytopenic purpura (ITP), and easy bruising is a common symptom. Platelets are blood cells that help stop bleeding and form clots.
In some rare cases, hyperthyroidism may also impact the level of stress hormones, particularly cortisol. Altered levels of cortisol may lead to thinner and weaker skin and blood vessels, and can affect blood pressure. However, this is rare in hyperthyroidism.
Consulting with a healthcare professional is a good idea if you notice you’re bruising more easily or more frequently than usual. These steps may help you determine the cause of easy bruising:
- Look for patterns: Are you getting bruising without bumping into anything? Do you have multiple bruises or bruises that take a long time to go away?
- Talk with a doctor about possible causes: If bruising is a concern, a healthcare professional may assess possible causes, including medication side effects, nutritional deficiencies, platelet count, and autoimmune conditions like ITP.
- Consider a specialist, if possible: An endocrinologist may help with hyperthyroidism treatment, and a hematologist can focus on your blood.
- Adhere to treatment: Untreated hyperthyroidism may lead to complications, including thyroid storm, which is a life threatening condition. Following your treatment as indicated and having regular check-ups is important to monitor your thyroid hormone levels. In addition, you also want to follow the doctor’s instructions to prevent or reduce bruising.