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Blood disorders can affect any of the three main components of blood: 1  Red blood cells, which carry oxygen to the body's tissues. 2  White blood cells, which fight infections. 3  Platelets, which help blood to clot.
If blood clots go to your brain, they can affect your speech, your facial expression, use of your arms or legs and cause loss of vision in an eye or double vision. There may be confusion and not being able to understand or speak, trouble walking, dizziness and loss of balance and possible sudden severe headaches.