SAD

The initialism SAD may refer to:

Medicine

• Sagittal abdominal diameter, body diameter at the waistline
• Schizoaffective disorder, a psychiatric diagnosis
• Seasonal affective disorder, typically winter depression
• Separation anxiety disorder in children
• Social anxiety disorder, in social situations
• Specific antibody deficiency, a kind of primary immunodeficiency
• Standard American diet or Western pattern diet
• Syncope, angina, and dyspnea, classic symptoms of severe aortic stenosis

Organisations

• Shiromani Akali Dal, a political party in India
• Sociedad Anónima Deportiva, a type of incorporated sports club in Spain
• Sociedade Anónima Desportiva, a type of incorporated sports club in Portugal
• Special Activities Division, of the US CIA

Science and technology

• Selected area diffraction, a crystallographic experimental technique
• Single-wavelength anomalous dispersion, in X-ray crystallography
• Source axis distance in external beam radiotherapy, the distance from the source of photons to the isocentre
• Sum of absolute deviations (or least absolute deviations), a mathematical optimization technique
• Sum of absolute differences, a simple metric for motion estimation in video compression
• Systems analysis and design, in science

Other uses

• Single Administrative Document, for customs declarations in the European Union Customs Union
• Singles Awareness Day, a humorous holiday every February 14
• Suicide Attack Database, for 1982-2013
• "S.A.D.", a song by Man Overboard on the album Heart Attack

See also

• Sad (disambiguation)