Chronic daily headaches and tight next muscles, is bad neck posture the cause?

Your chronic daily headaches fit into the classification of muscle contraction headaches. While it is possible that poor neck posture may be a cause, chronic stress & tension are more common causes. If this pertains to you, consider stress management therapy which should be helpful.

It is likely that the "tight neck muscles" are triggering tension headaches, but the chronic daily pattern might suggest an additional cause such as underlying migraine issues. Both the headaches and neck pain need further evaluation and interventions to break up this pattern. See your doctor and discuss the appropriate steps.