Blood thinner

Blood thinners are medicines that are used to reduce the risk of blood clots. This helps in preventing blockages in veins and arteries which can lead to serious health conditions such as heart attacks, strokes and other conditions. Get medical advice from a registered GP online about blood thinners or any symptom you are concerned about.

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Blood thinner side effects

Increased tendency to bleed

The most common side effect is an increased tendency to bleed, meaning cuts or injuries may bleed longer than usual, and bruising can occur from even minor bumps.

Discomfort and bleeding

Other side effects include nosebleeds, gum bleeding, or stomach discomfort.

Nausea and skin issues

Some people may experience nausea, hair thinning, or mild skin rashes as well.

This guide does not replace professional care. Consult a doctor to manage your symptoms. In emergencies, call 000 or visit a hospital immediately. The content is research-backed & medically reviewed by Dr. Ammar AL-ANI, MBChB, CCBST, AMC

Uses

Blood thinners are used predominantly to prevent blood clots. These clots lead to a variety of medical issues such as:

Atrial Fibrillation (Afib): To prevent clots formation as a result of irregular heartbeats.
Deep Vein Thrombosis (DVT): Used for clots in leg veins to prevent them from travelling to the lungs.
Pulmonary Embolism (PE): Prevents or treats clots that reach the lungs.
Stroke prevention: Especially in people with heart rhythm issues or certain heart valve conditions.
After surgeries: For those who’ve had major surgeries, especially knee or hip replacements, to prevent clot formation.

Side Effects of Blood Thinners

Increased tendency to bleed longer than usual from cuts or injuries
Bruising from minor bumps
Nosebleeds or gum bleeding
Stomach discomfort
Less common: nausea, hair thinning, or mild skin rashes

Blood thinners are essential for preventing clots but require careful monitoring due to these side effects.

When to See a Doctor on Blood Thinners

You should consult the doctor immediately if you experience:

Unusual or excessive bruising
Bleeding that does not stop
Blood in your stool or black, tarry stools
Coughing up blood
Severe or persistent headaches
Vomiting blood or vomit that looks like coffee grounds
Unexplained swelling or pain
Heavy or prolonged menstrual bleeding (for women)
Sudden dizziness, weakness, or fainting

These symptoms may indicate internal bleeding or other complications and require prompt medical review.

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