杵状指甲是氧气含量降低的症状，可能预示着心脏和肺部疾病。 Clubbed fingernails, a sign of decreased oxygen levels, could indicate heart and lung diseases.

指甲的形状和颜色等特征可以指示出贫血、肝脏问题、真菌感染、牛皮癣和关节炎等健康问题。 Fingernail characteristics, like shape and color, can indicate health issues such as anemia, liver problems, fungal infections, psoriasis, and arthritis. 杵状指甲的特点是向下弯曲且角度扭曲，可能表明心脏和肺部疾病导致氧气水平降低。 Clubbed fingernails, characterized by a downward curve and distorted angle, may suggest decreased oxygen levels due to heart & lung diseases.