 [ Symptoms ] if i am a smoker under the affordable care act will i have to pay more for health insurance [ Disease ] i am sorry to hear this walking is excellent for your health except when it causes exhaustion if this is a new symptom i would suggest you make an appointment with your primary care provider for an exam and some blood work many things can cause these feelings of tiredness from seasonal allergies to anemia only a medical professional can give you a good answer if you just started a walking regimen and are feeling tired all day maybe it is because you are overdoing it try starting with a 10 15 minute walk and then work up to longer time periods as your stamina increases of course while walking is usually considered safe no one should start an exercise program without their doctor is consent wishing you all the best