ABH, s. 47 - Actus reus/mens rea
"Any hurt or injury calculated to interfere with the health or comfort of the victim" - Donovan 
Offences Against the Person Act 1861 (s.47)
Caused by an assault or battery which leads to further injury - mens rea refers to these, not the ABH itself.
Mens rea: intention or (Cunningham) recklessness
CPS charging standard defines difference between ABH and GBH by severity of injury:
- Loss of/ breaking of tooth
- Temporary loss of sensory functions or consciousness
- Extensive or multiple bruising
- Displaced, broken nose or other minor fractures
- Minor (but not superficial) cuts, probably requiring medical attention (e.g. stitches)
Cutting a woman's hair is sufficient hurt or injury for an ABH - DPP v Smith 
ABH, s. 47 - Psychological harm
Psychological harm can constitute ABH, but only where it is a "medically recognised psychiatric condition" -
- Chan-Fook  (stalking)
- Constanza  (stalking)
- Ireland and Burstow  (stalking)
- Dhaliwal  (domestic violence)
nb. these authoritites also apply to the definition of GBH
Expert evidence is always required to prove ABH - Morris 
Dhaliwal - if the victim is only feeling a strong sense of ordinary grief, fear, anxiety etc. then this will not result in a criminal conviction. It must be more than that.
Only a medically recognised mental illness will be considered sufficient to impose criminal liability on the defendant (unless the defendant poses a threat to public order).