What causes the blood to appear dark when bleeding after acupuncture?

Generally speaking, black blood appearing during acupuncture and bloodletting may be related to factors such as needle-induced vascular injury, poor circulation of qi and blood, excessive cold-damp pathogenic factors, blood hypoxia, or the presence of toxins in the body. When experiencing bodily discomfort, individuals should seek timely medical evaluation and appropriate treatment. Specific explanations are as follows:

1. Needle-induced vascular injury

Acupuncture causes minor damage to the skin. However, due to individual differences in blood vessel wall thickness, some people have relatively thinner vessel walls, making them more prone to bleeding during needling. The blood may appear dark or black upon exiting the body because it has been oxidized by exposure to air. This phenomenon is considered normal and does not require treatment.

2. Poor circulation of qi and blood

When internal blood circulation is impaired, patients may suffer from significant blood stasis. Acupuncture can accelerate blood flow, which might temporarily worsen local blood stagnation, leading to the appearance of dark blood at the puncture site. In such cases, patients may improve their condition through massage therapy.

3. Excessive cold-damp pathogenic factors

If one neglects proper warmth and self-care, cold and damp pathogens may invade the body. When cold-dampness is severe, a patient's blood may appear darker or blackish. In such cases, continued acupuncture treatment under medical supervision can help regulate qi and blood circulation. Additionally, medications such as Renshen Jianpi Pills or Sheduqing Capsules may be taken as directed by a physician.

4. Blood hypoxia

When blood oxygen levels are low, blood may appear darker in color. This condition requires medical evaluation and treatment. In cases of severe hypoxia, supplemental oxygen therapy may be used to relieve symptoms.

5. Presence of toxins in the body

In patients with toxin accumulation, blood tends to be thicker and more viscous. Acupuncture may facilitate the expulsion of these toxins along with the blood, resulting in dark-colored blood during the procedure. Patients experiencing this may benefit from taking heat-clearing and detoxifying medications as prescribed, such as Yinqiao Jiedu Tablets or Banlangen Granules.

In addition, dark blood during acupuncture could also indicate underlying conditions such as rheumatic diseases or liver and gallbladder disorders. If other symptoms occur, patients are advised to seek prompt medical attention to avoid delayed diagnosis and treatment. Daily precautions should include maintaining warmth, engaging in moderate exercise, and consuming more fresh fruits and vegetables.