Define broadly, faith healing is the attempt to use religious or spiritual means such as prayer to prevent illness, cure disease, or simply improve health. Proponents claim that prayers, mental practices, spiritual insights, or other techniques can summon divine or supernatural intervention on behalf of the ill. According to the varied beliefs of those who practice it, faith healing may be said to afford gradual relief from pain or sickness or to bring about a sudden "miracle cure", and it may be used in place of, or in tandem with, conventional medical techniques for alleviating or curing diseases. Faith healing has been criticized on the grounds that those who use it may delay seeking potentially curative conventional medical care. This is particularly problematic when parents use faith healing techniques on children.