The legal landscape surrounding physical injuries in the Philippines is governed primarily by the Revised Penal Code (RPC). When an individual sustains bodily harm due to the intentional act or negligence of another, the law categorizes the offense based on the severity of the injury and the duration of medical attendance required for healing.

I. Classification of Physical Injuries

In Philippine law, physical injuries are classified into three main categories. The distinction is critical because it determines the severity of the penalty and the court that has jurisdiction over the case.

1. Less Serious Physical Injuries (Article 265)

These are injuries that are not particularly grave but require medical attendance or incapacitate the victim from labor for ten (10) to thirty (30) days.

Key Factor: The duration of healing/incapacity must fall strictly within this window.
Qualified Less Serious Physical Injuries: The penalty is higher if the offender is the victim’s parent, ascendant, guardian, or teacher, or if there was manifest intent to insult or humiliate the victim.

2. Serious Physical Injuries (Article 263)

This is a more severe charge applied when the injury results in permanent or long-term damage. The law specifies four levels based on the outcome:

Permanent Disability/Deformity: If the victim becomes insane, imbecile, impotent, or blind.
Loss of Body Parts: If the victim loses the use of a speech organ, a hand, a foot, an arm, or a leg, or loses the use thereof.
Deformity or Loss of Other Organs: If the victim becomes deformed or loses any other part of their body (e.g., an ear or a finger), or loses the use thereof.
Illness/Incapacity for more than 30 Days: If the injury causes illness or incapacity for labor for more than thirty (30) days.

3. Slight Physical Injuries (Article 266)

These are minor injuries where the victim requires medical attendance or is incapacitated for one (1) to nine (9) days. This also includes:

Physical injuries which do not prevent the victim from engaging in their habitual work nor require medical attendance.
Ill-treatment (Maltreatment): Physical contact that does not cause an actual injury but is offensive or abusive (e.g., a slap that leaves no mark).

II. Intent vs. Negligence

The nature of the charge also depends on the "state of mind" of the perpetrator:

Intentional: The offender deliberately meant to cause harm (Dolo).
Reckless Imprudence (Article 365): The injury was the result of a lack of foresight or skill, such as in vehicular accidents. This is often referred to as "Physical Injuries through Reckless Imprudence."

III. Essential Evidence Needed

To secure a conviction for physical injuries in the Philippines, the prosecution must present specific pieces of evidence to prove both the act and the extent of the damage.

1. Medical Certificate (Medico-Legal Certificate)

This is the most crucial piece of evidence. It must be issued by a licensed physician who examined the victim.

Content: It should detail the nature of the injury (e.g., laceration, contusion, fracture) and, crucially, the estimated period of healing.
Note: If the doctor estimates 15 days of healing, the charge will likely be Less Serious Physical Injuries. Without this estimate, the court may default to Slight Physical Injuries.

2. Testimony of the Victim and Witnesses

The victim must testify to identify the perpetrator and describe how the assault occurred. Eyewitness accounts help establish the "how" and "why" of the incident, proving that the injury wasn't self-inflicted or accidental.

3. Photographs

Clear photos of the injuries immediately after the incident and during the healing process provide a visual record that supports the medical findings.

4. Objects Used (Corpus Delicti)

If a weapon was used (a blunt instrument, a knife, etc.), it should be recovered and presented to the court to show the potential for lethality or the intent of the offender.

IV. Procedural Requirements: The Barangay Conciliation

For Slight and Less Serious Physical Injuries, the law generally requires the parties to undergo Barangay Conciliation first (under the Katarungang Pambarangay Law).

A "Certificate to File Action" from the Barangay is usually required before a formal complaint can be filed in court.
Exception: If the crime carries a maximum penalty of imprisonment exceeding one year, or if the parties reside in different cities/municipalities (with some exceptions), the case may go straight to the Prosecutor’s Office.

V. Special Laws and Higher Penalties

Certain circumstances may move the case out of the "Physical Injuries" articles of the RPC and into special laws:

Republic Act 9262 (VAWC): If the victim is a woman or her child and the offender is a domestic partner, the charge is filed under this law, which carries much heavier penalties and protective measures.
Republic Act 7610 (Child Abuse): If the victim is a minor, physical injuries may be classified as child abuse, especially if intended to debase or demean the child's intrinsic worth.

Would you like me to draft a sample Affidavit-Complaint for a physical injuries case based on these legal standards?