FAST-test

Three indications of a stroke.  If one or more indications are positive, contact a physician as soon as possible.

Face

A section of the face, usually only on one side, is drooping and hard to move.

Arm

Arm weakness: The inability to raise one's are fully.

Speech

Speech difficulties: An inability or difficulty to understand or produce speech.

Time

Time is of the essence when having a stroke, and an immediate call to emergency services or trip to the hospital is recommended.

As soon as the indications above are possitive, call 112.  A quick treatment will reduce the amount of damage significantly and increase the chances of recovery.