Cupping has a documented adverse-event literature, and it is worth knowing before deciding to try it. The common, expected effect is a circular bruise from broken capillaries - it looks dramatic but is usually harmless and fades.
The more serious reports are burns from the flame method, blisters and subsequent infection, and scars. Severe events requiring hospital care have been published, though they are uncommon. Risk rises sharply when the person doing it is untrained, when the same equipment is reused without proper cleaning, or when cupping is applied over broken or inflamed skin.
Cupping is not appropriate over varicose veins, on anyone taking anticoagulants, in pregnancy over the abdomen and lower back, or on skin that is already damaged. Marked bruising in someone on blood thinners is a reason to seek advice rather than to continue.
拔罐有可查的不良事件文献，决定尝试前值得了解。最常见、也属预期内的是毛细血管破裂形成的圆形瘀斑——看上去夸张，但通常无害，会自行消退。
较严重的报告包括火罐造成的烧伤、水疱及继发感染与瘢痕。已有需要住院处理的严重事件发表，但并非常见。风险明显升高的情况包括：操作者未受训、器具重复使用且未规范清洁，以及在破损或发炎的皮肤上操作。
静脉曲张处、正在服用抗凝药者、孕期腹部与腰骶部、以及已有皮肤损伤的部位，都不适合拔罐。服用抗凝药者出现明显瘀斑，应咨询专业人士而不是继续做。
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