What can it be that makes swallowing a little difficult?

See GI doctor: Difficulty swallowing ("dysphagia") can be distinguished as a "transfer" problem (difficulty moving food from mouth to top of esophagus), "transit" problem (difficulty moving food down the esophagus), "spasm", gerd (due to sphincter problems), or obstructive (webs, rings, strictures, ulcer, tumor). Best to see a gastroenterologist (gi doctor) for evaluation and treatment.