The scientific community has criticized alternative medicine as being based on misleading statements, quackery, pseudoscience, antiscience, fraud, or poor scientific methodology.
Biorhythms, which like astrology relied uncritically on birth dates, did not meet the criterion of pseudoscience at the time because there were no alternative explanations for the same observations.
Criticism of pseudoscience, generally by the scientific community or skeptical organizations, involves critiques of the logical, methodological, or rhetorical bases of the topic in question.