What did the court decide in Estelle v. Gamble?
Answered for: US
We therefore conclude that deliberate indifference to serious medical needs of prisoners constitutes the "unnecessary and wanton infliction of pain,"
The Court set the deliberate-indifference standard for prisoner medical claims and separately restated that a pro se complaint is to be liberally construed. The sentence above is the court in its own words.
This answer is true in US and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for US.