And high antigen levels are sometimes caused by noncancerous problems.
With us, our lack of punctuality is sometimes caused by the parents.
Attacks are sometimes caused by certain drugs, such as barbiturates and some antibiotics.
Confusion is sometimes caused by the terms hypersensitivity, hypersusceptibility, and idiosyncrasy.
Sepsis – blood poisoning – sometimes caused by meningitis, kills babies and children if they do not rapidly get antibiotics.
Unlike apes, it lacked a frontal sinus (which is responsible for the feeling of "brain freeze" sometimes caused by eating ice-cream).
The technique could also be used to look for side effects, which are sometimes caused by drugs binding to proteins in unexpected ways.
But background noise and drop-outs, sometimes caused by tape pinging away from the heads when the sound was being recorded, were common.
Scientists hope they may be able to help people who have suffered heart failure, sometimes caused by a heart attack, in which the heart cannot pump enough blood round the body.
Those associated with eruptions are sometimes caused by oversteepening of a volcano's flank by intrusion of a shallow body of magma within or just beneath the volcanic cone, as happened at Mount St. Helens.
