Inadequate warm up before and after exercise is one of the frequent causes of calf and groin pain while running. Apart from that dehydration can also cause these symptoms. One of the other common causes is a condition called over pronation. Over pronation basically means that your feet are rolling over too much as you run which causes excessive pressure on the calf muscle and achilles tendon.
Do stretching exercises before and after running and take sips of water when you feel dehydrated. If symptoms persist then you may apply cold compresses and take some anti inflammatory pain killers.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
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