Answer
The Revised Penal Code classifies physical injuries into three degrees, based on the gravity of the harm and the resulting period of incapacity for labor or need for medical attendance: serious physical injuries (Article 263), less serious physical injuries (Article 265), and slight physical injuries (Article 266).
Serious physical injuries involve grave consequences — such as the loss or uselessness of a body part or sense, insanity, deformity, or an illness or incapacity for labor for more than 30 days. Less serious physical injuries cause incapacity or require medical attendance for 10 days or more but not more than 30. Slight physical injuries are the least grave — incapacity or medical attendance of 1 to 9 days, or injuries that do not prevent the offended party from doing his habitual work.