UPDATE: This is a replacement of the first chapter. After completing a couple more chapters, I found myself unable to write any more on the subject of lung cancer for personal reasons. I changed some things in the first scene, and that required me to redo the second part of this chapter. I hope that nobody is disappointed about the slight change of plot, but it's something I had to do. Sorry for the confusion and change, and thanks. (I actually think this will be a far better story, now).

Hey, everyone. I feel like I haven't been on here in forever, and I certainly have some reviewing to get caught up on. Yes, I know I have not updated in a long time, and did plan on updating "Birthright" tonight, but because of recent things, I got this idea and had to write it. It'll probably be getting updated more often than my other stories. I hope you enjoy this story about sick!Reid.

Disclaimer- I do not (and probably never will) own anything to do with Criminal Minds.

Enjoy!

After running, the UnSub, Mike Barton, finally stopped, realizing he was caught and not getting away, but he still pointed his gun to the young agent in front of him.

Reid had his gun pointed at the UnSub. The run had exhausted him, and he felt a bit dizzy, as he had for the past couple of weeks. He even had a bit of difficultly holding his gun straight at the man. Hotch and Morgan were right behind him.

"FBI," Reid tried to sound commanding. You need to exercise more, he told himself, that's all. "Drop your weapon."

Morgan and Hotch had now completely caught up and were now training their guns on the UnSub, as well. Mike looked like a deer in headlights, eyes flickering between the three agents, but mostly between the two older men, probably presuming they were the two biggest threats.

"Mike Barton, drop the gun, now!" Morgan demanded. "This doesn't have to be any harder than it already has to be."

The delusional criminal licked his lips, "w-will I get to see Mary again?"

Mary had been Mike's girlfriend, until he'd killed her in one of his episodes. The man had gone on a killing spree, claiming that each of his victims had Mary.

Reid's eyes darted to his teammates. "Yes," he said, trying to focus. If you put down your gun now, and surrender yourself, we can go see Mary." The young man could feel the dark and surprised glances of his teammates watching him, but he couldn't lie, and he was positive that if Mike was told he'd killed his girlfriend, he'd turn his gun on himself. Reid knew he couldn't lose another person's life when there was a chance he could stop it.

At the same time, the genius seriously wished that the UnSub would do something already. He didn't know how much longer he could last with the sun in his eyes, making his head ache even worse. He'd been suffering from horrible headaches that had gradually gotten worse for weeks. You're fine, Spencer. Just do you job.

"You're… you're sure?"

"Yes, I'm sure." Reid could see the sudden bit of light in the UnSub's eyes as he gave a small smile and put down his gun.

Instantly, Morgan and went to grab Mike, cuffing him, and Reid turned and walked a few feet away, putting his hands on his head, desperately trying to get rid of some of the pressure in his head. He rubbed at his eyes and leaned against a nearby tree for support as dizziness came over him, and nausea struck him.

"You all right?" He heard Hotch ask from where he was now standing behind him.

"Yeah," Reid looked at the unit chief, blinking a couple of times, and stood up straighter. "I'm fi‒," Reid bent over and leaned against the tree again as his headache flared up, worse than ever. He stood up shakily again, "what were just talking about?"

"Reid!" Hotch rushed over to him and put an arm around his shoulder. "Reid, what's wrong?"

"What? Nothing's wrong," Reid said, confusion in his eyes, and suddenly winced, his hands going up to clutch at his temples. "My head…"

"Hotch? Reid?" Morgan asked as he jogged up to them after handing Mike off to the paramedics. "What's going on?"

"I'm not sure‒" Hotch began to say, but was cut off as Reid fell to the ground and started convulsing and shaking.

His two collegues were immediately beside him, rolling him onto his side as he started vomiting. "Morgan, go! Call the paramedics, and tell them an agent is having a seizure. I'll take care of Reid."

Morgan got out his phone and ran off, and Hotch's eyes widened as he took in the scene before him.

"Family of Spencer Reid?" The middle-aged man, who'd previously introduced himself as Dr. Collins, entered the waiting area, and the team all stood up, waiting for answers.

"How is he?" Hotch asked the doctor.

"He's stable," the team members all breathed a sigh of relief and let the man continue. "Patients with seizures are often brought in, and we usually just have to figure out why they are undergoing a seizure in the first place. Has Spencer mentioned anything else? Other symptoms?"

Hotch thought for a moment, but Rossi spoke up first. "I think we've all noticed him acting a bit differently, these past few weeks. More easily annoyed, tired, distant, even. Like he's having trouble concentrating."

The doctor nodded, and Hotch added to what Rossi said when Dr. Collins finished writing the new information down. "Right before he had the seizure, it was obvious that he had a serious headache, and he had to lean against a tree for balance," the unit chief told him. "One moment he told me he was fine, the next he had no idea what was happening."

"Is that all?" Dr. Collins asked as he finished recording what Hotch had told him.

Hotch looked around at the worried faces of the team. "Yes, I think so."

"Do you have any idea of what the cause might be?" Garcia asked, and the doctor eyed her and the bright attire she was wearing.

"A couple. Agent Hotchner, you are his medical proxy. Will you come and talk to me alone for a moment?"

Hotch nodded and followed the doctor around the corner. Usually he would've said that everybody could hear, but he honestly didn't want to share Reid's private health information until he was given permission from the genius himself.

Dr. Collins turned to him and looked him in the eye, "Agent Hotchner, Spencer is displaying many signs of a brain tumor. We're going to have to run some tests."

"Reid" and review, please.

Is anybody else really nervous for the finale?