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If any of these serious disorders are present, the individual will usually have additional symptoms such as chest pain, a feeling of a racing heart, loss of speech or a change in vision. Many people, especially as they age, experience lightheadedness if they arise too quickly from a lying or seated position.
Unexplained weight loss: Weight loss that is unintended and not explained by diet, exercise or other illness may be a warning sign of many types of cancer Unexplained pain : Pain that persists, has no clear cause, and does not respond to treatment may be a warning sign of many types of cancers.
Feeling lightheaded can also be a sign of low blood sugar, Dr. Shaikh says. This happens because the brain isn’t getting enough glucose, which the brain needs for energy.
A greyout is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. [1] It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure. Greyouts have a variety of possible causes:
In rare circumstances, the disease is recognized only after the cancerous cells overwhelm the bone marrow, resulting in low red blood cells, neutrophils, or platelets. [12] This can then result in symptoms such as fever, easy bleeding/bruising, night sweats, weight loss, and increased tiredness. [ 12 ]
Low blood pressure and a fast heart rate after the event may indicate blood loss or dehydration, while low blood oxygen levels may be seen following the event in those with pulmonary embolism. [1] Routine broad panel laboratory testing detects abnormalities in <2–3% of results and is therefore not recommended. [20]
Cachexia (/ k ə ˈ k ɛ k s i ə / [1]) is a syndrome that happens when people have certain illnesses, causing muscle loss that cannot be fully reversed with improved nutrition. [2] It is most common in diseases like cancer, congestive heart failure, chronic obstructive pulmonary disease, chronic kidney disease, and AIDS.
Chocolate-brown blood due to methemoglobinemia. Signs and symptoms of methemoglobinemia (methemoglobin level above 10%) include shortness of breath, cyanosis, mental status changes (~50%), headache, fatigue, exercise intolerance, dizziness, and loss of consciousness.