The arrow was a weapon in their culture, it was used to hunt and provide for their families as well as offer protection, and because of this it was a tool for sustaining life. One of the biggest factors in altering the meaning, is the way the arrow is depicted or placed in the tattoo design.
1 Symptoms of blood clots in the lung (pulmonary embolus) are chest pain, shortness of breath, and rapid pulse and breathing.  Symptoms of a stroke (blood clot in an artery of the brain) include loss of speech, vision, and weakness on one side of the body.
A blood clot can form in, or travel to, the veins or arteries in the heart, lung, brain, kidneys and limbs. A clot can block or limit blood flow, causing damage to the body's organs, or other serious medical problems, and even death. Signs and symptoms vary depending on where the clot forms.