What constitutes a "serious medical need" for a prisoner?

A "serious" medical need exists if the failure to treat a prisoner's condition could result in further significant injury or the "unnecessary and wanton infliction of pain." Id. (citing Estelle, 429 U.S. at 104). The existence of an injury that a reasonable doctor or patient would find important and worthy of comment or treatment; the presence of a medical condition that significantly affects an individual's daily activities; or the existence of chronic and substantial pain are examples of indications that a prisoner has a "serious" need for medical treatment. Id. at 1059-60 (citing Wood v. Housewright, 900 F.2d 1332, 1337-41 (9th Cir. 1990)).