Common Signs of Aspirin-Induced Bleeding
Aspirin inhibits platelet function, increasing bleeding risk, especially at high doses or with long-term use. Symptoms often appear in the gastrointestinal tract, but can occur elsewhere. Key indicators include:
- Blood in stool or vomit: Black, tarry stools (melena) from upper GI bleeding, or bright red blood (hematochezia) from lower GI sources. Vomit may look like coffee grounds if blood is partially digested.[1]
- Easy bruising or prolonged bleeding: Large, unexplained bruises on the skin, or cuts/nicks that bleed longer than usual (e.g., after shaving).[2]
- Nosebleeds or gum bleeding: Frequent epistaxis or bleeding when brushing teeth.[1][2]
Where Bleeding Typically Occurs
- Gastrointestinal (most common): Up to 15% of chronic users experience occult or overt GI bleeding, often without pain initially. Stomach pain, nausea, or anemia from slow blood loss follows.[3]
- Intracranial: Rare but serious; watch for severe headache, confusion, weakness, or vision changes—seek emergency care.[2]
- Other sites: Heavy menstrual bleeding, hematuria (blood in urine), or excessive bleeding post-injury/surgery.[1]
What Raises the Risk
Factors amplifying symptoms include age over 60, concurrent use with NSAIDs/anticoagulants (e.g., warfarin), alcohol, or conditions like ulcers/Helicobacter pylori infection. Symptoms may develop gradually (e.g., fatigue from anemia) or acutely after overdose.[3][4]
When to Seek Help
Mild symptoms like minor bruising may resolve by stopping aspirin, but persistent black stools, dizziness, rapid heartbeat, or fainting signal significant blood loss—call emergency services. Diagnosis often involves stool tests for occult blood, endoscopy, or blood counts.[2][4]
[1] Mayo Clinic: Aspirin Side Effects
[2] FDA: Aspirin Label Warnings
[3] American College of Gastroenterology: NSAID-Induced Ulcers
[4] UpToDate: Aspirin and Hemorrhage