I was reading 2 Corinthians (chapters 11 & 12) and Paul mentioned "a thorn in the flesh". I believe it is intentionally vague as to what it is referring to because the what is not important but the how he deals with it, is the true importance. He "begs" the Lord three times that he may be rid of it, but God said, "My grace is sufficient for you, for power is made perfect in weakness". As I reflect, I start to see all the thorns that are poking me. I cannot pluck them out on my own, I must pray to God for help, then listen for how I should handle. Some, He will take away and others he will allow to stay. That ones that stay, are there for a reason. God only gives us what we can handle and our challenges / sufferings are for a purpose. We will either grow from them or they may help someone else. Just trust in God and spread the Word.
