The criteria dating back to the 1964 Surgeon Generals report remain useful as guidelines for evaluating evidence (USDHEW 1964), but they were not intended to be applied strictly or as a checklist that needed to be met before the designation of causal could be applied to an association
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Symptoms of a Blood Clot in the Heart Experiencing a blood clot in the heart typically means experiencing a heart attack, which causes symptoms like: Chest pain Pain in the left arm, shoulder, upper back, or neck Breathing difficulties Coughing or wheezing Dizziness and fainting Fatigue Cold sweats Stomach pain (for women and AFAB patients) Flu-like symptoms (for women and AFAB patients) Symptoms of a Blood Clot in the Brain Experiencing a blood clot in the brain or neck typically means experiencing a stroke or TIA (transient ischemic attack), which causes symptoms like: Lack of muscle control on either the left or right side of the body Speech issues Drooping face or lack of facial muscle control Mental confusion Emotional or behavioral changes Symptoms of a Blood Clot in the Arteries of the Legs or Arms Development of blisters or sores Necrosis, or tissue death Peeling skin due to skin sloughing Physical weakness in the arm, leg, or affected body part Pins and needles sensations Skin that appears paler than normal Skin that is cold to the touch Symptoms of a Blood Clot in the Veins of the Legs or Arms Skin that appears darker than normal Pain in the leg, arm, or affected area Arm or leg swelling Vein swelling Skin that feels warm to the touch Symptoms of a Pulmonary Embolism Sharp chest pain Referred pain in the arms, shoulders, back, jaw, or neck Pain while inhaling Breathing difficulties, whether active or at rest Middle Georgia Heart Offers Vein Treatments to Treat Thrombosis and Related Conditions

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