Normal Sperm
A normal sperm cell has an oval head and a straight tail that is between seven and 15 times longer than the head. Any deviation from this shape is considered abnormal morphology.
Smoking
According to the World Health Organization, smoking and exposure to cigarette smoke has been linked to abnormal morphology.
Testicular Defects
Defects in the testicles that are present from birth are linked to abnormal morphology. These defects may not be ordinarily visible without medical examination.
Drug Use
Use of illegal drugs has been shown to affect sperm morphology, according to the World Health Organization. This includes drugs such as cannabis, heroin, cocaine and LSD.
High Fever
The presence of a high fever can affect the quality of a man's sperm. Repeating the analysis of the sperm in four to six weeks can determine whether the morphology problem is temporary or permanent.
Cashie Evans
Cashie is a freelance writer covering a variety of topics, including parenting, tips and tricks. She took her love of writing to the Web. Cashie attended Louisiana State University and received her bachelor’s degree in 2009.
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