In the Philippine jurisdiction, the act of inflicting physical harm upon another is not merely a private dispute but a criminal offense against the State. The Revised Penal Code (RPC), as amended, serves as the primary governing statute, classifying physical injuries based on their severity, the duration of medical attendance required, and the intent of the perpetrator.

Understanding the legal landscape of physical injuries requires a distinction between the three primary classifications: Less Serious Physical Injuries, Serious Physical Injuries, and Slight Physical Injuries.

1. Serious Physical Injuries (Article 263, RPC)

The law treats physical injuries as "serious" when the damage to the victim’s body results in permanent or long-term disability. The penalties are graduated based on the specific outcome of the assault:

Permanent Disability/Deformity: If the victim becomes insane, imbecile, impotent, or blind as a result of the injury.
Loss of Body Parts: If the victim loses the use of a limb, or the power of speech, hearing, or smell, or loses an eye or any other principal member.
Period of Incapacity: If the injury results in illness or incapacity for labor for more than 90 days.
Deformity or Loss of Non-Principal Member: If the injury causes a deformity or the loss of a part of the body that is not considered a "principal member," or causes incapacity for more than 30 days but less than 90.

Penalties: These range from Prision Mayor (6 to 12 years) to Arresto Mayor (1 month and 1 day to 6 months), depending on the specific subsection of Article 263 that applies.

2. Less Serious Physical Injuries (Article 265, RPC)

An injury is classified as "less serious" when it does not fall under the categories of "serious" but still requires significant recovery time.

The 10-Day Rule: The injury must require medical attendance for ten days or more, but not more than thirty days, or must incapacitate the victim for labor during that same period.
Qualifying Circumstances: If the offender manifests a clear intent to insult or humiliate the victim (ignominy) or if the victim is the offender's parent, ascendant, or guardian, the penalty is increased.

Penalties: Generally Arresto Mayor (1 month and 1 day to 6 months).

3. Slight Physical Injuries (Article 266, RPC)

This is the most common classification, involving minor altercations where the physical damage is superficial or heals quickly.

Under 9 Days: Injuries that require medical attendance or incapacitate the victim for one to nine days.
No Medical Attendance: Injuries that do not prevent the victim from working or require medical attention, but were still caused by physical ill-treatment.
Ill-treatment: Often referred to as "Physical Ill-treatment," this covers acts like slapping or pushing where no visible injury is sustained but the victim’s person was violated.

Penalties: Arresto Menor (1 to 30 days) or a fine.

The Element of Intent: Frustrated or Attempted Homicide

A critical distinction in Philippine criminal law is the intent to kill. If a person inflicts a physical injury with the clear intention of ending the victim's life, the charge may be elevated from Physical Injuries to Attempted or Frustrated Homicide/Murder.

If the wound is mortal (would have caused death) but the victim survives due to timely medical intervention, it is Frustrated.
If the offender commences the act but fails to perform all acts of execution (e.g., the gun jams or the victim escapes), it is Attempted.
Without proof of intent to kill, the offender is only liable for the physical injuries actually produced.

Special Laws and Protective Statutes

In certain contexts, the Revised Penal Code is supplemented by special legislation that imposes harsher penalties:

Republic Act No. 9262 (VAWC)

If the victim is a woman or her child, and the perpetrator is a person with whom she has or had a sexual or dating relationship, the physical injury is prosecuted under the Anti-Violence Against Women and Their Children Act. Penalties are generally one degree higher than those in the RPC.

Republic Act No. 7610 (Child Abuse)

Physical injuries inflicted upon a minor (under 18) may be classified as Child Abuse if the act debases or demeans the intrinsic worth and dignity of the child as a human being.

Civil Liability: The Cost of the Injury

Every person criminally liable for a felony is also civilly liable. In physical injury cases, the offender is often ordered to pay:

Actual/Compensatory Damages: Medical bills, hospitalization costs, and lost wages.
Moral Damages: For the physical suffering, mental anguish, and fright experienced by the victim.
Exemplary Damages: Imposed as a deterrent against socially deleterious actions, especially if aggravating circumstances were present.
Attorney’s Fees: Costs incurred by the victim in prosecuting the case.

Justifying and Mitigating Circumstances

A defendant may avoid or reduce liability by proving specific circumstances:

Self-Defense: The defendant must prove unlawful aggression by the victim, reasonable necessity of the means employed to prevent it, and lack of sufficient provocation on the part of the defendant.
Passion or Obfuscation: If the injury was committed in a state of sudden extreme emotion caused by the victim, the penalty may be reduced.
Physical Defect: Under Article 13, if the offender has a physical defect that restricts their means of action, it may serve as a mitigating factor.