It can happen due to low fitness levels stress dehydration heat or underlying health conditions
Dehydration can make your heart work harder even during light activity
Anxiety and stress can cause your heart to beat faster while walking slowly
Walking in hot weather can increase your heart rate as your body regulates temperature
Caffeine can increase heart rate or make palpitations more noticeable in some people
Extra body mass can increase the effort required to walk and raise your heart rate
Cardiovascular fitness can improve over several weeks with consistent appropriate exercise
Nicotine can increase heart rate and smoking can reduce cardiovascular fitness
Beginners may experience higher heart rates but persistent or unusual elevations should be checked
Sudden changes in pace stress dehydration inaccurate wearable readings or heart rhythm problems may be responsible