My neck veins bulge a lot when i talk, laugh, lie down, or sometimes stand upright. is this related to heart palpitations or how my neck veins twitch?

Normal veins: It is not uncommon for veins in the neck to stand out when you increase pressure in your chest. This can occur when you cough, laugh, or bear down. Neck veins can also bulge when you have too much fluid in your body or when part of your heart is not working properly. A doctor may examine you and listen to the heart for evaluation. It is not generally related to heart rhythm problems.

Normal variant: As long as you have normal blood pressure and no prior cardiac history, this is most likely a normal variant. If you are having palpitations, make sure you get that checked, that should be unrelated to prominent neck veins.