 | | Primary lateral sclerosis (PLS) | | This motor neuron disease causes nerves within the brain to slowly break down, resulting in muscle weakness primarily in the legs, arms and tongue. | |
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| | |  | | Tetralogy of Fallot | | Learn more about a rare condition caused by a combination of four heart defects that are present at birth (congenital). | |
 | | Postpartum preeclampsia | | Learn about this rare condition that's typically associated with pregnancy, but that can occur after delivery, too. Untreated, it can lead to serious complications. | |
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