<s>[INST] Hi, may I answer your health queries right now ? Please type your query here... I m 58, 5 7 about 235. Former smoker (quit in 93). This morning while seated on the phone I laughed so hard I could not breath in and I believe I passed out as my phone was on the floor and I could remember what I was doing for a few seconds. What s up with that? [/INST] Hi, There can be various reasons for this kind of fainting spells. It basically occurs when there is reduced blood flow to the brain. It can be due to heart related conditions (arrhythmia - abnormal rhythm), anemia, hypoglycemia (reduced sugar), hypotension (reduced blood pressure), brain disorders (seizures) or electrolyte imbalance (abnormal salts). However, sometimes prolonged standing, excessive heat (warm weather), increased stress or anxiety, prolonged fasting, increased alcohol intake can also cause such problems. I feel that take proper diet. Avoid the precipitating causes as discussed above. But do go for some investigations like complete blood count, electrolytes, ECG, fasting sugar and MRI brain. This will help us find the exact cause. Take care. Hope I have answered your question. Let me know if I can assist you further.  </s>